Life with Unix says: Author of make, f77 and efl. Has nice wine cellar.

A Research Unix Reader says: Stu (Stuart M Feldman implemented, with Andy (Andrew D.) Hall, the efl preprocessor to sugar Fortran with PL/I-ish syntax. He wrote the pi Fortran compiler single-handedly and invented the famous make. A man of taste and culture, Stu exhibited both in his underground classic on UNIX style