The senior leadership team at Simulations Plus, Inc. includes:

Walter WWalter S. Woltosz – Mr. Walter S. Woltosz is Chairman of the Board and Chief Executive Officer at Simulations Plus, Inc. He is a co-founder of the Company and has served as its Chief Executive Officer and as Chairman of the Board of Directors since its incorporation in July 1996. View Auburn University’s 2016 Lifetime Achievement Award Recipient Video



Thaddeus Grasela, PharmD, Ph.D. – Dr. Ted Grasela is President of Simulations Plus. Ted joined Simulations Plus in the fall of 2014 as part of our acquisition of Cognigen. Ted has extensive experience in modeling and simulation, clinical pharmacology, and outcomes research. Ted has built Cognigen into a profitable industry leader in the high-quality analysis of clinical trial data, serving customers ranging from top-5 pharmaceutical companies to numerous mid- and smaller-size organizations.


John R. Kneisel – Mr. John Kneisel is Chief Financial Officer of Simulations Plus and joined the Company in November 2013. He worked as the Western Regional Controller of Group 1 Automotive Inc. from August 2004 through October 2009. At that time he started a consulting business providing outsourced financial management services (CFO and Controller) to small to medium sized companies. In October 2010 he became the CFO of Dreamhammer, Inc. where he worked until August 2012. His career spans 30 plus years of financial management and accounting related services.


Michael B. Bolger, Ph.D. – Dr. Michael B. Bolger is Chief Scientist at Simulations Plus. He joined the company in 1996 and programmed the first version of GastroPlus in 1997. He works with our team of scientists and programmers on the continued development of modeling & simulation software programs. In addition to his role at Simulations Plus, he is currently Adjunct Full Professor of Pharmacology and Pharmaceutical Sciences at USC. In 1996, he was elected to the rank of AAAS Fellow by the American Association for the Advancement of Science.


Jill Fiedler-Kelly  Ms. Jill Fiedler-Kelly is Vice President, Pharmacometric Services at Simulations Plus.  A co-founder of Cognigen, Ms. Fiedler-Kelly has over 20 years experience in the design and implementation of pharmacometrics M&S approaches in drug development programs and in PK/PD model development. She is Adjunct Associate Professor of Pharmaceutical Sciences at the University at Buffalo and has co-authored Introduction to Population PK/PD Analysis with Nonlinear Mixed Effects Models with Joel Owen of Union University. In 2016, Ms. Fiedler-Kelly was named Fellow of the International Society of Pharmacometrics.

JohnDJohn A. DiBella – Mr. John A. DiBella is Vice President, Marketing and Sales at Simulations Plus. He joined the company in 2003, spending time working on the development of GastroPlus and DDDPlus software and consulting projects. Now, he leads the marketing & sales activities for the company while continuing to travel the world hosting training seminars.


Robert D. Clark, Ph.D. – Dr. Robert D. Clark is Director, Cheminformatics at Simulations Plus. He joined the company in 2010, working with the scientists on the development of ADMET Predictor and MedChem Studio. Prior to joining the company, he worked at Monsanto Co. on screening, physiology, and SAR-guided synthesis. Having risen to the post of VP of Science and Research, Bob left Tripos, Inc. to found Biochemical Infometrics, an independent research and consulting company specializing in drug design. He continues to serve as an adjunct professor at Indiana University.