Stuart Feldman has played a prominent role in the evolution of the computer industry. He wrote Make, a key software program for Unix operating systems, and developed the first 77 compiler for the Fortran programming language. He went on to become vice president of engineering at Google. Feldman’s next stop, however, is Wall Street. He has been hired by Citadel Securities, the high-speed electronic trading firm owned by billionaire Ken Griffin, as a senior advisor. Citadel Securities is the nation’s biggest equity and options market maker, responsible for one in every five stock trades in Am...