(1951, Chemical Engineering), former president and CEO of Esso Eastern, an Exxon company, and former Executive Vice President of Esso Europe.[189] John H. Sinfelt (1951 B.S., 1953 M.S., 1954 Ph.D., Chemical Engineering), whose research on catalytic reforming led to the development of unleaded gasoline. William L. Weiss (1951, Industrial Engineering), former Chairman and CEO of Ameritech, one of the Baby Bells formed after the 1984 AT&T divestiture.[190]