Mary Margaret O'Reilly

Mary Margaret O'Reilly (October 14, 1865 - December 6, 1949) was the acting director of the Mints and Assay Office of the United States Department of the Treasury and later assistant treasurer. She was known as the "sweetheart of the Treasury".
Biography.
She was born on October 14, 1865 in Springfield, Massachusetts. She started work at the mint in 1904.
A presidential executive order allowed her to work past her mandated retirement age. 
She retired at age 73 in 1938. She died in Washington, D.C. on December 6, 1949.