Egon Balas
# Egon Balas

Egon Balas (June 7, 1922 in Cluj, Romania – March 18, 2019) was an applied mathematician and a professor of industrial administration and applied mathematics at Carnegie Mellon University. He was the Thomas Lord Professor of Operations Research at Carnegie Mellon's Tepper School of Business and did fundamental work in developing integer and disjunctive programming.

## Life and education

Balas was born in Cluj (Romania) in a Hungarian Jewish family. His original name was Blatt, which was first changed to the Hungarian Balázs and then later to the Romanian Balaş. He was married to art historian Edith Balas, a survivor of Auschwitz, with whom he had two daughters. He was imprisoned by the Communist authorities for several years after the war.

He left Romania in 1966 and accepted an appointment with Carnegie Mellon University in 1967. Balas obtained a "Diploma Licentiate" in economics (Bolyai University, 1949) and Ph.D.s in economics (University of Brussels, 1967) and mathematics (University of Paris, 1968). His mathematics PhD thesis was titled Minimax et dualité en programmation discrète and was written under the direction of Robert Fortet.

### Selected publications

* E. Balas, A. Saxena: Optimizing Over the Split Closure, Mathematical Programming 113, 2 (2008), 219–240.
* E. Balas, M. Perregaard: A Precise Correspondence Between Lift-and-Project Cuts, Simple Disjunctive Cuts, and Mixed Integer Gomory Cuts for 0-1 Programming, Mathematical Programming B (94), 2003; 221–245.
* E. Balas, S. Ceria, G. Cornuéjols: Mixed 0-1 Programming by Lift-and-Project in a Branch-and-Cut Framework, Management Science 42, 1996; 1229–1246.
* E. Balas: The Prize Collecting Traveling Salesman Problem: II Polyhedral Results, Networks 25, 1995; 199–216.
* E. Balas, S. Ceria, G. Cornuéjols: A Lift-and-Project Cutting Plane Algorithm for Mixed 0-1 Programs, Mathematical Programming 58, 1993; 295–324.
* E. Balas: The Prize Collecting Traveling Salesman Problem I, Networks 19, 1989; 621–636.
* E. Balas, J. Adams, D. Zawack: The Shifting Bottleneck Procedure for Job Shop Scheduling, Management Science 34, 1988; 391–401.
* E. Balas, V. Chvátal, J. Nesetril: On The Maximum-Weight Clique Problem, Mathematics of Operations Research 12, 1987; 522–536.
* E. Balas: Disjunctive Programming, Annals of Discrete Mathematics 5, 1979; 3–51.
* E. Balas: An Additive Algorithm for Linear Programming in Zero-One Variables, Operations Research 13 (4), 1965; 517–546.

### Honors and awards

* National Academy of Engineering, 2006
* IFORS Hall of Fame, 2006
* Honorary Doctorate in Mathematics, University of Waterloo, 2005
* Hungarian Academy of Science, external member, 2004
* INFORMS Fellow, 2002
* Honorary Doctorate in Mathematics, Miguel Hernandez University, Elche, Spain, 2002
* EURO Gold Medal, 2001
* John von Neumann Theory Prize, INFORMS, 1995
* Senior U.S. Scientist Award of the von Humboldt Foundation, 1980–1981
