Doug Sax

Doug Lionel Sax (April 26, 1936 – April 2, 2015) was an American mastering engineer from Los Angeles, California. He helped create three of The Doors' albums, including their 1967 debut; six of Pink Floyd's albums, including "The Wall"; Ray Charles' multiple-Grammy winner "Genius Loves Company" in 2004, and Bob Dylan's 36th studio album "Shadows in the Night" in 2015. 
Sax died on April 2, 2015, at the age of 78 from cancer in Los Angeles.