- Statistics
- Econometrics
- Mathematical economics
- Operations research
- Decision theory
He is best known for his work in the field of stochastic programming, which is a branch of operations research that deals with decision problems under uncertainty. He is also known for his contributions to the theory of decision-making under risk.
Some of his most notable publications include:
- *Stochastic Programming: A Survey of Theory and Applications* (1987)
- *Decision Theory and Mathematical Programming* (1989)
- *Risk Analysis and Stochastic Programming* (1992)
- *Stochastic Programming: Theory and Applications* (2004)
- *Optimization, Risk, and Uncertainty* (2008)
He is a Fellow of the Royal Netherlands Academy of Arts and Sciences and a member of the Econometric Society.