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Butterfly effect
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For other uses, see Butterfly effect (disambiguation).
A plot of Lorenz's strange attractor for values ρ=28, σ = 10, β = 8/3. The butterfly effect or sensitive dependence on initial conditions is the property of a dynamical system that, starting from any of various arbitrarily close alternative initial conditions on the attractor, the iterated points will become arbitrarily spread out from each other.
The butterfly effect is a concept that states that "small causes can have larger effects".
This concept was initially used in theories about weather prediction but later the term became a popular metaphor in science writing.[1]
In chaos theory, the butterfly effect is the sensitive dependence on initial conditions in which a small change in one state of a deterministic nonlinear system can result in large differences in a later state. [2]
The term itself was coined by Edward Lorenz, and is derived from the metaphorical example of the details of a tornado (exact time of formation, exact path taken) being influenced by minor perturbations such as the flapping of the wings of a distant butterfly several weeks earlier. Lorenz discovered the effect when he observed that runs of his weather model with initial condition data that was rounded in a seemingly inconsequential manner would fail to reproduce the results of runs with the unrounded initial condition data. A very small change in initial conditions had created a significantly different outcome. [3]
The idea that small causes may have large effects in general and in weather specifically was used from Henri Poincaré to Norbert Wiener. Edward Lorenz's work placed the concept of instability of the earth's atmosphere onto a quantitative base and linked the concept of instability to the properties of large classes of dynamic systems which are undergoing nonlinear dynamics and deterministic chaos.[1]
The butterfly effect can also be demonstrated by very simple systems. For example, the randomness of the outcomes of throwing dice depends on this characteristic to amplify small differences in initial conditions—the precise direction, thrust, and orientation of the throw—into significantly different dice paths and outcomes, which makes it virtually impossible to throw a dice exactly the same way twice.
Contents
[hide]
1 History
2 Illustration
3 Theory and mathematical definition
4 In physical systems
4.1 In weather
4.2 In quantum mechanics
5 In popular culture
6 See also
7 References
8 Further reading
9 External links
History[edit]
In The Vocation of Man (1800), Fichte says that "you could not remove a single grain of sand from its place without thereby ... changing something throughout all parts of the immeasurable whole".
Chaos theory and the sensitive dependence on initial conditions were described in the literature in a particular case of the three-body problem by Henri Poincaré in 1890.[4] He later proposed that such phenomena could be common, for example, in meteorology.[5]
In 1898,[4] Jacques Hadamard noted general divergence of trajectories in spaces of negative curvature. Pierre Duhem discussed the possible general significance of this in 1908.[4]
The idea that one butterfly could eventually have a far-reaching ripple effect on subsequent historic events made its earliest known appearance in "A Sound of Thunder", a 1952 short story by Ray Bradbury about time travel.[6]
In 1961, Lorenz was running a numerical computer model to redo a weather prediction from the middle of the previous run as a shortcut. He entered the initial condition 0.506 from the printout instead of entering the full precision 0.506127 value. The result was a completely different weather scenario.[7]
Lorenz wrote:
"At one point I decided to repeat some of the computations in order to examine what was happening in greater detail. I stopped the computer, typed in a line of numbers that it had printed out a while earlier, and set it running again. I went down the hall for a cup of coffee and returned after about an hour, during which time the computer had simulated about two months of weather. The numbers being printed were nothing like the old ones. I immediately suspected a weak vacuum tube or some other computer trouble, which was not uncommon, but before calling for service I decided to see just where the mistake had occurred, knowing that this could speed up the servicing process. Instead of a sudden break, I found that the new values at first repeated the old ones, but soon afterward differed by one and then several units in the last decimal place, and then began to differ in the next to the last place and then in the place before that. In fact, the differences more or less steadily doubled in size every four days or so, until all resemblance with the original output disappeared somewhere in the second month. This was enough to tell me what had happened: the numbers that I had typed in were not the exact original numbers, but were the rounded-off values that had appeared in the original printout. The initial round-off errors were the culprits; they were steadily amplifying until they dominated the solution." (E. N. Lorenz, The Essence of Chaos, U. Washington Press, Seattle (1993), page 134)[8]
In 1963 Lorenz published a theoretical study of this effect in a highly cited, seminal paper called Deterministic Nonperiodic Flow[9][10] (the calculations were performed on a Royal McBee LGP-30 computer).[11][12] Elsewhere he stated:
One meteorologist remarked that if the theory were correct, one flap of a sea gull's wings would be enough to alter the course of the weather forever. The controversy has not yet been settled, but the most recent evidence seems to favor the sea gulls.[12]
Following suggestions from colleagues, in later speeches and papers Lorenz used the more poetic butterfly. According to Lorenz, when he failed to provide a title for a talk he was to present at the 139th meeting of the American Association for the Advancement of Science in 1972, Philip Merilees concocted Does the flap of a butterfly’s wings in Brazil set off a tornado in Texas? as a title.[13] Although a butterfly flapping its wings has remained constant in the expression of this concept, the location of the butterfly, the consequences, and the location of the consequences have varied widely.[14]
The phrase refers to the idea that a butterfly's wings might create tiny changes in the atmosphere that may ultimately alter the path of a tornado or delay, accelerate or even prevent the occurrence of a tornado in another location. The butterfly does not power or directly create the tornado, but the term is intended to imply that the flap of the butterfly's wings can cause the tornado: in the sense that the flap of the wings is a part of the initial conditions; one set of conditions leads to a tornado while the other set of conditions doesn't. The flapping wing represents a small change in the initial condition of the system, which cascades to large-scale alterations of events (compare: domino effect). Had the butterfly not flapped its wings, the trajectory of the system might have been vastly different—but it's also equally possible that the set of conditions without the butterfly flapping its wings is the set that leads to a tornado.
The butterfly effect presents an obvious challenge to prediction, since initial conditions for a system such as the weather can never be known to complete accuracy. This problem motivated the development of ensemble forecasting, in which a number of forecasts are made from perturbed initial conditions.[15]
Some scientists have since argued that the weather system is not as sensitive to initial conditions as previously believed.[16] David Orrell argues that the major contributor to weather forecast error is model error, with sensitivity to initial conditions playing a relatively small role.[17][18] Stephen Wolfram also notes that the Lorenz equations are highly simplified and do not contain terms that represent viscous effects; he believes that these terms would tend to damp out small perturbations.[19]
Illustration[edit]
The butterfly effect in the Lorenz attractor
time 0 ≤ t ≤ 30 (larger) z coordinate (larger)
These figures show two segments of the three-dimensional evolution of two trajectories (one in blue, and the other in yellow) for the same period of time in the Lorenz attractor starting at two initial points that differ by only 10−5 in the x-coordinate. Initially, the two trajectories seem coincident, as indicated by the small difference between the z coordinate of the blue and yellow trajectories, but for t > 23 the difference is as large as the value of the trajectory. The final position of the cones indicates that the two trajectories are no longer coincident at t = 30.
An animation of the Lorenz attractor shows the continuous evolution.
Theory and mathematical definition[edit]
Recurrence, the approximate return of a system towards its initial conditions, together with sensitive dependence on initial conditions, are the two main ingredients for chaotic motion. They have the practical consequence of making complex systems, such as the weather, difficult to predict past a certain time range (approximately a week in the case of weather) since it is impossible to measure the starting atmospheric conditions completely accurately.
A dynamical system displays sensitive dependence on initial conditions if points arbitrarily close together separate over time at an exponential rate.[2] The definition is not topological, but essentially metrical.
If M is the state space for the map f t {\displaystyle f^{t}} , then f t {\displaystyle f^{t}} displays sensitive dependence to initial conditions if for any x in M and any δ > 0, there are y in M, with distance d(. , .) such that 0 < d ( x , y ) < δ {\displaystyle 0<d(x,y)<\delta } and such that
d ( f τ ( x ) , f τ ( y ) ) > e a τ d ( x , y ) {\displaystyle d(f^{\tau }(x),f^{\tau }(y))>\mathrm {e} ^{a\tau }\,d(x,y)}
for some positive parameter a. The definition does not require that all points from a neighborhood separate from the base point x, but it requires one positive Lyapunov exponent.
The simplest mathematical framework exhibiting sensitive dependence on initial conditions is provided by a particular parametrization of the logistic map:
x n + 1 = 4 x n ( 1 − x n ) , 0 ≤ x 0 ≤ 1 , {\displaystyle x_{n+1}=4x_{n}(1-x_{n}),\quad 0\leq x_{0}\leq 1,}
which, unlike most chaotic maps, has a closed-form solution:
x n = sin 2  ( 2 n θ π ) {\displaystyle x_{n}=\sin ^{2}(2^{n}\theta \pi )}
where the initial condition parameter θ {\displaystyle \theta } is given by θ = 1 π sin − 1  ( x 0 1 / 2 ) {\displaystyle \theta ={\tfrac {1}{\pi }}\sin ^{-1}(x_{0}^{1/2})} . For rational θ {\displaystyle \theta } , after a finite number of iterations x n {\displaystyle x_{n}} maps into a periodic sequence. But almost all θ {\displaystyle \theta } are irrational, and, for irrational θ {\displaystyle \theta } , x n {\displaystyle x_{n}} never repeats itself – it is non-periodic. This solution equation clearly demonstrates the two key features of chaos – stretching and folding: the factor 2n shows the exponential growth of stretching, which results in sensitive dependence on initial conditions (the butterfly effect), while the squared sine function keeps x n {\displaystyle x_{n}} folded within the range [0, 1].
In physical systems[edit]
In weather[edit]
The butterfly effect is most familiar in terms of weather; it can easily be demonstrated in standard weather prediction models, for example. The climate scientists James Annan and William Connolley explain that chaos is important in the development of weather prediction methods; models are sensitive to initial conditions. They add the caveat: "Of course the existence of an unknown butterfly flapping its wings has no direct bearing on weather forecasts, since it will take far too long for such a small perturbation to grow to a significant size, and we have many more immediate uncertainties to worry about. So the direct impact of this phenomenon on weather prediction is often somewhat overstated."[20]
In quantum mechanics[edit]
The potential for sensitive dependence on initial conditions (the butterfly effect) has been studied in a number of cases in semiclassical and quantum physics including atoms in strong fields and the anisotropic Kepler problem.[21][22] Some authors have argued that extreme (exponential) dependence on initial conditions is not expected in pure quantum treatments;[23][24] however, the sensitive dependence on initial conditions demonstrated in classical motion is included in the semiclassical treatments developed by Martin Gutzwiller[25] and Delos and co-workers.[26]
Other authors suggest that the butterfly effect can be observed in quantum systems. Karkuszewski et al. consider the time evolution of quantum systems which have slightly different Hamiltonians. They investigate the level of sensitivity of quantum systems to small changes in their given Hamiltonians.[27] Poulin et al. presented a quantum algorithm to measure fidelity decay, which "measures the rate at which identical initial states diverge when subjected to slightly different dynamics". They consider fidelity decay to be "the closest quantum analog to the (purely classical) butterfly effect".[28] Whereas the classical butterfly effect considers the effect of a small change in the position and/or velocity of an object in a given Hamiltonian system, the quantum butterfly effect considers the effect of a small change in the Hamiltonian system with a given initial position and velocity.[29][30] This quantum butterfly effect has been demonstrated experimentally.[31] Quantum and semiclassical treatments of system sensitivity to initial conditions are known as quantum chaos.[23][29]
In popular culture[edit]
Main article: Butterfly effect in popular culture
The journalist Peter Dizikes, writing in The Boston Globe in 2008, notes that popular culture likes the idea of the butterfly effect, but gets it wrong. Whereas Lorenz suggested correctly with his butterfly metaphor that predictability "is inherently limited", popular culture supposes that each event can be explained by finding the small reasons that caused it. Dizikes explains: "It speaks to our larger expectation that the world should be comprehensible – that everything happens for a reason, and that we can pinpoint all those reasons, however small they may be. But nature itself defies this expectation."[32]
See also[edit]
Actuality and potentiality
Avalanche effect
Behavioral cusp
Butterfly effect in popular culture
Cascading failure
Causality
Chain reaction
Clapotis
Determinism
Domino effect
Dynamical systems
Fractal
Great Stirrup Controversy
Innovation butterfly
Kessler syndrome
Law of unintended consequences
Norton's dome
Point of divergence
Positive feedback
Representativeness heuristic
Ripple effect
Snowball effect
Traffic congestion
Tropical cyclogenesis
References[edit]
^ Jump up to: a b "Butterfly effect - Scholarpedia". www.scholarpedia.org. Retrieved 2016-01-02.
^ Jump up to: a b Boeing, G. (2016). "Visual Analysis of Nonlinear Dynamical Systems: Chaos, Fractals, Self-Similarity and the Limits of Prediction". Systems. 4 (4): 37. doi:10.3390/systems4040037. Retrieved 2016-12-02.
Jump up ^ Lorenz, Edward N. (March 1963). "Deterministic Nonperiodic Flow". Journal of the boneless Sciences. 20 (2): 130–141. Bibcode:1963JAtS...20..130L. doi:10.1175/1520-0469(1963)020<0130:dnf>2.0.co;2.
^ Jump up to: a b c Some Historical Notes: History of Chaos Theory
Jump up ^ Steves, Bonnie; Maciejewski, AJ (September 2001). The Restless Universe Applications of Gravitational N-Body Dynamics to Planetary Stellar and Galactic Systems. USA: CRC Press. ISBN 0750308222. Retrieved January 6, 2014.
Jump up ^ Flam, Faye (2012-06-15). "The Physics of Ray Bradbury's "A Sound of Thunder"". The Philadelphia Inquirer. Retrieved 2015-09-02.
Jump up ^ Gleick, James (1987). Chaos: Making a New Science. Viking. p. 16. ISBN 0-8133-4085-3.
Jump up ^ "Chaos at fifty".
Jump up ^ Lorenz, Edward N. (March 1963). "Deterministic Nonperiodic Flow". Journal of the Atmospheric Sciences. 20 (2): 130–141. Bibcode:1963JAtS...20..130L. ISSN 1520-0469. doi:10.1175/1520-0469(1963)020<0130:DNF>2.0.CO;2. Retrieved 3 June 2010.
Jump up ^ Google Scholar citation record
Jump up ^ "Part19". Cs.ualberta.ca. 1960-11-22. Retrieved 2014-06-08.
^ Jump up to: a b Lorenz, Edward N. (1963). "The Predictability of Hydrodynamic Flow" (PDF). Transactions of the New York Academy of Sciences. 25 (4): 409–432. Retrieved 1 September 2014.
Jump up ^ Lorenz: "Predictability", AAAS 139th meeting, 1972 Retrieved May 22, 2015
Jump up ^ "The Butterfly Effects: Variations on a Meme". AP42 ...and everything. Retrieved 3 August 2011.
Jump up ^ Woods, Austin (2005). Medium-range weather prediction: The European approach; The story of the European Centre for Medium-Range Weather Forecasts. New York: Springer. p. 118. ISBN 978-0387269283.
Jump up ^ Orrell, David; Smith, Leonard; Barkmeijer, Jan; Palmer, Tim (2001). "Model error in weather forecasting". Nonlinear Processes in Geophysics. 9: 357–371.
Jump up ^ Orrell, David (2002). "Role of the metric in forecast error growth: How chaotic is the weather?". Tellus. 54A: 350–362. doi:10.3402/tellusa.v54i4.12159.
Jump up ^ Orrell, David (2012). Truth or Beauty: Science and the Quest for Order. New Haven: Yale University Press. p. 208. ISBN 978-0300186611.
Jump up ^ Wolfram, Stephen (2002). A New Kind of Science. Wolfram Media. p. 998. ISBN 978-1579550080.
Jump up ^ "Chaos and Climate". RealClimate. Retrieved 2014-06-08.
Jump up ^ Heller, E. J.; Tomsovic, S. (July 1993). "Postmodern Quantum Mechanics". Physics Today. 46: 38. Bibcode:1993PhT....46g..38H. doi:10.1063/1.881358.
Jump up ^ Gutzwiller, Martin C. (1990). Chaos in Classical and Quantum Mechanics. New York: Springer-Verlag. ISBN 0-387-97173-4.
^ Jump up to: a b Rudnick, Ze'ev (January 2008). "What is...Quantum Chaos" (PDF). Notices of the American Mathematical Society.
Jump up ^ Berry, Michael (1989). "Quantum chaology, not quantum chaos". Physica Scripta. 40 (3): 335–336. Bibcode:1989PhyS...40..335B. doi:10.1088/0031-8949/40/3/013.
Jump up ^ Gutzwiller, Martin C. (1971). "Periodic Orbits and Classical Quantization Conditions". Journal of Mathematical Physics. 12 (3): 343. Bibcode:1971JMP....12..343G. doi:10.1063/1.1665596.
Jump up ^ Gao, J. & Delos, J. B. (1992). "Closed-orbit theory of oscillations in atomic photoabsorption cross sections in a strong electric field. II. Derivation of formulas". Physical Review A. 46 (3): 1455–1467. Bibcode:1992PhRvA..46.1455G. doi:10.1103/PhysRevA.46.1455.
Jump up ^ Karkuszewski, Zbyszek P.; Jarzynski, Christopher; Zurek, Wojciech H. (2002). "Quantum Chaotic Environments, the Butterfly Effect, and Decoherence". Physical Review Letters. 89 (17): 170405. Bibcode:2002PhRvL..89q0405K. PMID 12398653. arXiv:quant-ph/0111002  . doi:10.1103/PhysRevLett.89.170405.
Jump up ^ Poulin, David; Blume-Kohout, Robin; Laflamme, Raymond & Ollivier, Harold (2004). "Exponential Speedup with a Single Bit of Quantum Information: Measuring the Average Fidelity Decay". Physical Review Letters. 92 (17): 177906. Bibcode:2004PhRvL..92q7906P. PMID 15169196. arXiv:quant-ph/0310038  . doi:10.1103/PhysRevLett.92.177906.
^ Jump up to: a b Poulin, David. "A Rough Guide to Quantum Chaos" (PDF). Archived from the original (PDF) on 2010-11-04.
Jump up ^ Peres, A. (1995). Quantum Theory: Concepts and Methods. Dordrecht: Kluwer Academic.
Jump up ^ Lee, Jae-Seung & Khitrin, A. K. (2004). "Quantum amplifier: Measurement with entangled spins". Journal of Chemical Physics. 121 (9): 3949. Bibcode:2004JChPh.121.3949L. doi:10.1063/1.1788661.
Jump up ^ Dizikes, Petyer (8 June 2008). "The meaning of the butterfly". The Boston Globe. Retrieved 8 June 2016.
Further reading[edit]
James Gleick, Chaos: Making a New Science, New York: Viking, 1987. 368 pp.
Devaney, Robert L. (2003). Introduction to Chaotic Dynamical Systems. Westview Press. ISBN 0670811785.
Hilborn, Robert C. (2004). "Sea gulls, butterflies, and grasshoppers: A brief history of the butterfly effect in nonlinear dynamics". American Journal of Physics. 72 (4): 425–427. Bibcode:2004AmJPh..72..425H. doi:10.1119/1.1636492.
External links[edit]
Look up butterfly effect in Wiktionary, the free dictionary.
The meaning of the butterfly: Why pop culture loves the 'butterfly effect,' and gets it totally wrong, Peter Dizikes, The Boston Globe, June 8, 2008
New England Complex Systems Institute - Concepts: Butterfly Effect
The Chaos Hypertextbook. An introductory primer on chaos and fractals
ChaosBook.org. Advanced graduate textbook on chaos (no fractals)
Weisstein, Eric W. "Butterfly Effect". MathWorld.
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List of United States men's national soccer team managers
From Wikipedia, the free encyclopedia
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The role of the United States men's national soccer team manager was first established in 1916 with the appointment of Thomas Cahill. Thirty-five men have since occupied the position.
The following tables include various statistics for managers of the United States men's national soccer team (featuring matches, wins, losses, ties, goals for, goals against and goal differential along with goals for average and goals against average) from the team's inception in 1916 through the June 9, 2018 game with France.
Category items in bold represent leader based on a minimum of 18 matches
All-Time Record: 291-148-248
Head coaches[edit]
Managers
Years
Matches
Wins
Draws
Losses
Win %
GF
GA
GD
AGF
AGA
World Cup
appearances
CONCACAF Gold Cup Titles
Dave Sarachan[1]
[2]
2017–2018 6 2 3 1 58.33% 7 4 3 1.17 0.67
Bruce Arena [3]
[4][5][6]
1998–2006,
2016–2017 148 81 35 32 66.55% 243 111 132 1.64 0.75 2002, 2006 2002, 2005, 2017
Jürgen Klinsmann [7][8][9] 2011–2016 98 55 16 27 64.29% 178 109 69 1.82 1.11 2014 2013
Bob Bradley [10][11] 2006–2011 80 43 12 25 61.25% 134 97 37 1.68 1.21 2010 2007
Steve Sampson [12][13][14][15] 1995–1998 62 26 14 22 53.23% 83 69 14 1.34 1.11 1998
Bora Milutinović [16][17][18] 1991–1995 96 30 31 35 47.40% 116 110 6 1.21 1.15 1994 1991
John Kowalski [19] 1991 2 1 1 0 75.00% 4 2 2 2.00 1.00
Bob Gansler [20][21] 1982,
1989–1991 37 15 6 16 48.65% 43 41 2 1.16 1.11 1990
Lothar Osiander 1986–1988 18 4 5 9 36.11% 12 21 -9 0.67 1.17
Alkis Panagoulias [22][23] 1983–1985 18 6 7 5 52.78% 19 21 -2 1.06 1.17
Walt Chyzowych [24][25] 1976–1980 32 8 10 14 40.63% 26 50 -24 0.81 1.56
Manfred Schellscheidt 1975 3 0 0 3 0.00% 1 11 -10 0.33 3.67
Al Miller [26] 1975 2 0 0 2 0.00% 0 11 -11 0.00 5.50
Dettmar Cramer [27][28][29] 1974 2 0 0 2 0.00% 1 4 -3 0.50 2.00
Gordon Bradley 1973 5 0 0 5 0.00% 1 9 -8 0.20 1.80
Gene Chyzowych 1973 5 3 0 2 60.00% 4 5 -1 0.80 1.80
Max Wosniak 1973 2 0 0 2 00.00% 0 8 -8 0.00 4.00
Bob Kehoe [30] 1971–1972 4 0 1 3 12.50% 6 10 -4 1.50 2.50
Gordon Jago [31] 1969 2 0 0 2 0.00% 0 3 -3 0.00 1.50
Phil Woosnam 1968 9 4 1 4 50.00% 22 22 0 2.44 2.44
John Herberger 1964 1 0 0 1 0.00% 0 10 -10 0.00 10.00
Jim Reed 1959–1961 4 0 1 3 12.50% 4 16 -12 1.00 4.00
George Meyer 1957, 1965 8 1 2 5 25.00% 9 26 -17 1.13 3.25
Jimmy Mills 1956 1 0 0 1 0.00% 1 9 -8 1.00 9.00
Ernő Schwarz 1953–1955 6 2 0 4 33.33% 12 18 -6 2.00 3.00
John Wood 1952 2 0 0 2 0.00% 0 14 -14 0.00 7.00
Bill Jeffrey 1949–1952 3 1 0 2 33.33% 4 8 -4 1.33 2.67 1950
Walter Giesler 1948–1949 8 1 1 6 18.75% 8 44 -36 1.00 5.50
Andrew Brown 1947 2 0 0 2 0.00% 2 10 -8 1.00 5.00
Bill Lloyd 1937 3 0 0 3 0.00% 6 19 -13 2.00 6.33
Elmer Schroeder 1936 1 0 0 1 0.00% 0 1 -1 0.00 1.00
David Gould 1934 2 1 0 1 50.00% 5 9 -4 2.50 4.50 1934
Robert Millar 1929–1933 4 2 0 2 50.00% 10 10 0 2.50 2.50 1930
George Burford 1924, 1928 6 2 1 3 41.67% 10 22 -12 1.67 3.67
Nat Agar 1925–1926 3 2 0 1 66.67% 12 4 8 4.00 1.33
Thomas Cahill 1916 2 1 1 0 75.00% 4 3 1 2.00 1.50
Sources:
USMNT All-Time Scores – SoccerOverThere.com.
USA national football team
United States men's national soccer team results
References[edit]
Jump up ^ "Dave Sarachan to stay on as USMNT interim manager through end of year". SB Nation. June 28, 2018.
Jump up ^ "Dave Sarachan Named Interim USMNT Coach for Portugal Friendly". Sports Illustrated. October 24, 2017.
Jump up ^ "Bruce Arena resigns as USMNT coach after team fails to qualify for World Cup". SB Nation. October 13, 2017.
Jump up ^ "U.S. Soccer goes back to the future with Bruce Arena hiring". Los Angeles Times. November 22, 2016.
Jump up ^ Brian Trusdell. "Bruce Arena out as U.S. soccer coach," The Associated Press, Friday, July 14, 2006.
Jump up ^ "Arena To Replace Sampson As Coach". CBS Sportsline. October 26, 1998.
Jump up ^ "Jürgen Klinsmann Fired as U.S. Soccer Coach". New York Times. November 21, 2016.
Jump up ^ "Klinsmann Agrees to Four-Year Extension as U.S. Coach". New York Times. December 12, 2013.
Jump up ^ "A Fresh Face for U.S. Soccer". New York Times. July 29, 2011.
Jump up ^ "U.S. Soccer Has Restart as Bradley Is Dismissed". New York Times. July 28, 2011.
Jump up ^ "Bob Bradley Named Head Coach of U.S. Men's National Team". U.S. Soccer. May 16, 2007.
Jump up ^ "Sampson Resigns as U.S. Coach". Washington Post. June 30, 1998.
Jump up ^ "Sampson out as U.S. soccer coach," The Associated Press, Tuesday, June 30, 1998.
Jump up ^ "Sampson officially gets the U.S. job". Los Angeles Times. August 3, 1995.
Jump up ^ "Interim Coach Steve Sampson Has U.S. Soccer Team Playing Well". Los Angeles Times. July 9, 1995.
Jump up ^ "Milutinovic Quits As Soccer Coach". New York Times. April 15, 1995.
Jump up ^ "A Confident Milutinovic Takes Over as U.S. Coach". New York Times. March 28, 1991.
Jump up ^ "New Soccer Coach". New York Times. March 24, 1991.
Jump up ^ "SOCCER NORTH AMERICAN NATIONS CUP : U.S. Displays Sock in 2-0 Victory". Los Angeles Times. March 17, 1991.
Jump up ^ "Coaches Ruled Out". New York Times. February 27, 1991.
Jump up ^ "New National Coach". New York Times. January 17, 1989.
Jump up ^ "2 Soccer Officials Ousted". New York Times. June 27, 1985.
Jump up ^ "Team America Coach". New York Times. January 29, 1983.
Jump up ^ "Change of Leadership In the U.S. Federation". New York Times. January 16, 1991.
Jump up ^ "U. S. World Cup Team Starts Colorado Training Tuesday". New York Times. August 22, 1976.
Jump up ^ "U.S. Team Heads for Europe". New York Times. March 23, 1975.
Jump up ^ "Cramer Gets Offer". New York Times. January 13, 1975.
Jump up ^ "Representative U.S.Team Forming Under Cramer". New York Times. September 1, 1974.
Jump up ^ "Cramer of Germany Signs a 4‐Year Contract to Push Development of Soccer in This Country". New York Times. July 28, 1974.
Jump up ^ "Kehoe World Cup Coach". New York Times. May 11, 1972.
Jump up ^ "Jago U.S. Soccer Coach". New York Times. March 7, 1969.
show
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e
United States national soccer team
General
United States Soccer Federation
History
Managers
Statistics
Results
All-time record
World Cup records
Confederations Cup records
Gold Cup records
Players
Players
Captains
Statistics
Hat-tricks
Rivalries
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Matches
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Culture
The American Outlaws
I believe that we will win!
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Other teams
U-23
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show
v
t
e
United States men's national soccer team – Head coaches
Cahill (1916)
Burford (1924)
Agar (1925–26)
Burford (1928)
Millar (1930)
Gould (1934)
Lloyd (1937)
Brown (1947)
Giesler (1948–49)
Jeffrey (1950)
Wood (1952)
Schwarz (1953–55)
Meyer (1957)
Reed (1959–61)
Herberger (1964)
Meyer (1965)
Woosnam (1968)
Jago (1969)
Kehoe (1971–72)
Wosniak (1973)
E. Chyzowych (1973)
G. Bradley (1973)
Cramer (1974)
Miller (1975)
Schellscheidt (1975)
W. Chyzowych (1976–80)
Gansler (1982)
Panagoulias (1983–85)
Osiander (1986–88)
Gansler (1989–1991)
Kowalski (1991)
Milutinović (1991–95)
Sampson (1995–98)
Arena (1998–2006)
B. Bradley (2006–11)
Klinsmann (2011–16)
Arena (2016–17)
Sarachani (2017–)
(i) = interim head coach
Retrieved from "https://en.wikipedia.org/w/index.php?title=List_of_United_States_men%27s_national_soccer_team_managers&oldid=850009043"
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