Born in 1940, Weil obtained in 1962 his Bachelor in economics and mathematics from Yale University, in 1965 his Master of Arts in industrial administration, and in 1966 his Doctor of Philosophy in economics both at the 1966 from the Tepper School of Business at Carnegie Mellon University.
In 1973 he became a Certified Public Accountant, and in 1974 a Certified Management Accountant. Weil started his academic career at the Booth School of Business in 1965, and worked there until his retirement in 2008. Since then he teaches at the Johns Hopkins University and the University of California, San Diego.
Weil"s consulting clients have included companies as "Bethlehem Steel, British Petroleum, Chevron, Cisco Systems, Ford Motor Company, Genentech, General Dynamics, General Foods, International Business Machines Corporation, McDonnell Douglas, Pepsico, Pillsbury, Polaroid, PricewaterhouseCoopers, and Visa United States of America." He also serves on several boards.
