He visited the Program in Applied Mathematics founded by Ahmed Cemal Eringen at Princeton University during 1977–1978. He was a professor of Mathematics at Clarkson during 1976-1985 where he became the Chairman of the Department of Mathematics and Computer Science in 1979. On July 1, 1985, he was appointed as the Dean of Science of Clarkson University and served there until he joined to the department of Applied Mathematics (APPM) at University of Colorado Boulder on June 30, 1989.[4]