Dr. Tolk is a Senior Principal Chief Scientist and Technology Integrator for the Modeling and Analysis Innovation Center (MAIC) of The MITRE Corporation in Charlottesville, VA. He is an adjunct Professor at Old Dominion University.Dr. Tolk was Chief Scientist at SimIS Inc. in Portsmouth, Virginia between 2013 and 2015, where has been responsible for the evaluation of emerging M&S technologies. He was also supporting key projects with systems engineering expertise.Dr. Tolk has been a faculty member (Professor) in the Department of Engineering Management and Systems Engineering at the Old Dominion University from 2006 to 2013. He held a joint appointment with the Modeling, Simulation, and Visualization Engineering department. He received his Ph.D. in Computer Science (1995) and has a M.S. in Computer Science (1988) from the University of the Federal Armed Forces, Germany. His emphasis was Applied Systems Science and Military Operations Research.Dr. Tolk was Senior Research Scientist at the Virginia Modeling Analysis & Simulation Center (VMASC) from 2002 to 2006. He was Vice President for Land Weapon Systems at the German company I.A.B.G., the main contractor for the German Ministry of Defense for Operations Research and Simulation applications for analyses, training, and experimentation, from 1998 to 2002. He was project manager for decision support systems and integration of M&S into Command and Control systems from 1995 to 1998.He received the Excellence in Research award from the Frank Batten College of Engineering and Technology in 2008, first Technical Merit Award of the Simulation Interoperability Standards Organization (SISO) in 2010, the Outstanding Professional Contribution award of the Society for Modeling and Simulation (SCS) in 2012, and the Distinguished Professional Achievements Award of SCS in 2014. He was recognized as a Fellow of SCS in April 2016. In December 2019, he received the Distinguished Contribution Award from the Association for Computing Machinery (ACM) for the Special Interest Group Simulation and Modeling.Dr. Tolk is senior member of ACM, IEEE and SCS.