He earned his M.S. and his Ph. D. in microbiology at the University of Illinois in 1975 and 1978 , respectively .
Stahl received his B.S. in microbiology from the University of Washington , cum laude , in 1971 .
Stahl earned Stahl 's M.S. and his Ph. D. in microbiology at the University of Illinois in 1975 and 1978 , respectively .
Stahl received his B.S. in microbiology from the University of Washington , cum laude , in 1971 .