[1] He has been a prolific author and has made significant contributions in Operations Research and Management Science.

He has contributed to the areas of inventory control, mathematical programming, and operations planning and scheduling.

He is well known for his developments of Inventory Control Models, Transportation Problems, DEA and Fuzzy Decision Analyses.

Lev is a professor and former Head of Decision Sciences Department at Drexel University, Philadelphia Pennsylvania, USA since 2009.

From 1987 to 1990 he served as the Head of The Management Department at Worcester Polytechnic Institute, Worcester MA and during 1970 to 1987 he served as the Chair of Management Department and a professor at Temple University, Philadelphia Pennsylvania, USA.