Operations research
De Leve was appointed Professor Operations research, in particular management scientific applications at the University of Amsterdam in 1972. Among his doctorate students were Henk Tijms (1972), Alexander Rinnooy Kan (1976), Jan Karel Lenstra (1976), P. Weeda (1978), Awi Federgruen (1978), Antoon Kolen (1982), Roy Jonker (1986), Anton Volgenant (1987), Jeroen de Kort (1992), Erik H.J. van der Sluis (1993), Nanda Piersma (1993) and Cees Duin (1994). He retired from the University of Amsterdam 1 September 1991.