Hans Levenbach began his career at AT&T Bell Laboratories as an applied statistician, consulting on forecasting applications, forecaster  training and developing decision support systems. After the breakup of the Bell System, he founded Delphus Inc.

He has taught statistics and forecasting courses at Columbia University in the Business School and Industrial Engineering Department as well MBA statistics at the Stern School of Business at New York University.

He is an elected Fellow, Past President and Treasurer of the International Institute of Forecasters, a member of INFORMS, APICS and the American Statistical Association. Hans is an elected member of International Statistical Institute.

In collaboration with the International Institute of Forecasters, Hans and Jim Cleary have been instrumental in designing and constructing the CPDF curriculum for the professional certification of demand forecasters.