George Lann Nemhauser (born 1937)[1] is an American operations researcher, the A. Russell Chandler III Chair and Institute Professor of Industrial and Systems Engineering at the Georgia Institute of Technology and the former president of the Operations Research Society of America.

[2] He was president of ORSA in 1981, chair of the Mathematical Programming Society, and founding editor of the journal Operations Research Letters.

[2] Nemhauser's research concerns large mixed integer programming problems and their applications.

[5] He also contributed important early studies of approximation algorithms for facility location problems[6] and for submodular optimization.

[2][9] He has won five awards from INFORMS: the George E. Kimball Medal for distinguished service to INFORMS and to the profession in 1988, the Frederick W. Lanchester Prize in 1977 for a paper on approximation algorithms for facility location and again in 1989 for his textbook Integer and Combinatorial Optimization, the Phillip McCord Morse Lectureship Award in 1992, the first Optimization Society Khachiyan Prize for Life-time Accomplishments in Optimization in 2010,[10] and the John von Neumann Theory Prize in 2012 (together with Laurence Wolsey).