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Lehigh University logo

Ted Ralphs

Department: Industrial and Systems Engineering

Position: Professor and Interim Department Chair

Address: Harold S. Mohler Laboratory
200 West Packer Avenue
Bethlehem, PA 18015
(610) 758-1280

Areas of Research

  • Supply Chain Management
  • Grid Computing/Large Scale Computation
  • Mathematical Optimization and Modeling
  • Financial Engineering
  • Analysis of Algorithms and Complexity
  • Numerical Analysis
  • Polyhedral Theory
  • Combinatorics
  • Energy Markets
  • Computing and Algorithm Development
  • Applied Game Theory
  • Software Engineering
  • Algebra and Discrete Mathematics


Dr. Ralphs' research focuses mainly on various aspects of large-scale computation and optimization. His research spans theory, computation, and application, with an aim of bridging the gap between theory and practice. His current research projects explore the theoretical and computational aspects of solving large-scale optimization problems through the exploitation of sophisticated mathematical techniques and high-performance computing technologies.

Dr. Ralphs is co-founder and director of the Computational Optimization Research at Lehigh (COR@L) Laboratory, chair of the the INFORMS Computing Society, and co-chair of Lehigh's Research Computing Steering Committee. Courses taught by Dr. Ralphs include computational methods, discrete optimization, nonlinear optimization, financial optimization, graphs and network flows, and algorithms in systems engineering.


  • Ph.D., M.S., Operations Research, Cornell University
  • M.S., Mathematics, Carnegie Mellon University
  • B.S., Applied Mathematics, Carnegie Mellon University