About the Company

GAMS is one of the leading tool providers for the optimization industry, with offices in the US and Germany. With customers in more than 120 countries, GAMS is used by multinational companies, universities, research institutions and governments in many different areas, including the energy and chemical industries, for economic modelling, agricultural planning, or manufacturing.

Started as a project at the World Bank by an economic modeling group in the 1970s, GAMS was the first software system to combine the language of mathematical algebra with traditional concepts of computer programming in order to efficiently describe and solve optimization problems. GAMS became a commercial product in 1987, when the GAMS Development Corporation was founded in Washington, D.C. Nowadays, algebraic modeling is considered to be the most productive way of implementing optimization models and decomposition methods for optimization problems. 

Our mission is to provide both commercial and academic users from all areas and from around the world with the best possible tool for their optimization purposes and to make a scarce resource more productive: the modeler.

The GAMS Management Team

Michael Bussieck

Dr. Michael Bussieck has a PhD in Mathematics from Technical University of Braunschweig, Germany. He worked from 1998 to 2004 at GAMS Development in Washington DC, USA as a senior optimization analyst. Since 2004 he has also been a managing partner of GAMS Software GmbH, leading the GAMS software development group. In addition to his development responsibilities, he frequently engages in customer optimization projects that deliver cutting-edge optimization technology to clients from industry (energy, automotive, and chemical), the military, and government throughout Europe and the US.

Michael has published in many first class optimization journals, frequently gives lectures at international conferences, and leads the academic outreach program at GAMS. He also serves as a member in the advisory board of the German OR Society.

Steve Dirkse

Dr. Steven Dirkse received his PhD in Computer Science from UW-Madison in 1994. After a year of teaching math and CS at Calvin College, he joined the staff at GAMS Development in 1995, becoming Director of Optimization in 2003 and President in 2016. His primary focus has been in software development, notably solvers and solver links, data utilities, multi-threading, and quality control and performance testing. He has also consulted on optimization projects with several GAMS clients during this time.

Steve has published in many leading journals, gives lectures at conferences, and is an active member of the community: e.g., he is a past Director and current Secretary/Treasurer of the INFORMS Computing Society. As part of his thesis research he developed the PATH solver for Mixed Complementarity Problems (MCP), a robust, large-scale solver that was a great leap forward in solving MCP. For the work on the PATH solver he was awarded the Beale-Orchard-Hayes Prize in 1997.

Franz Nelissen

Dr. Franz Nelissen has a PhD in Agriculture from the University of Giessen, Germany, and is a Certified Project Management Associate (GPM). Franz started working for GAMS in 1995 and was appointed to GAMS' Development Board of Directors in 2010. Over the course of his career, Franz has worked with customers in government, academia and commercial markets, has consulted on optimization projects worldwide, and is responsible for business development and international project management.

Franz is co-founder and managing partner of GAMS Software GmbH, which received the company award of the German Society of Operations Research (GOR) in 2010.