He has over 15 years experience in designing and implementing simulation frameworks and applications for government agencies, private industry and academia as well as prior experience in database development. Dr. Collier’s primary focus is on simulation toolkit design and implementation and the design and implementation of models using such. He was one of the original designers and the first lead developer of the Repast simulation toolkit and continues as part of the development team as well as being the lead developer of Repast HPC an agent-based simulation framework for high performance computing platforms.