The Immunetrics team is driven to advance mechanistic understanding of diseases, to advance global modeling capabilities, and to improve healthcare outcomes. With experts in mathematics, biology, and software engineering, we collaborate closely with our clients to solve new challenges with the most impact.


Steven Chang, M.S., CEO, Board Member, is a successful technology entrepreneur with more than 27 years of experience in identifying emerging market needs and combining state of the art technologies and resources to meet those needs. This includes raising over $30 million in corporate capital and starting/leading multiple early stage companies. His career includes diverse markets such as power generation, transportation logistics, critical care medicine, pharmaceutical drug development, quantitative systems pharmacology and mobile applications. He played a role in the early years of the monetization of the Internet by providing key research and development for multiple companies, including Yahoo!, to target users based on their specific behavior and interests. In the late 1990s, he helped commercialize proprietary technologies that enabled real-time ad hoc query processing on terabyte sized databases with no loss in data resolution.

Many of the technologies and products offered under his direction have been key to keeping billion dollar businesses competitive in their respective markets. Early in his career, Steve headed up the Intelligent Software Systems group at Westinghouse/CBS Corporation’s Science and Technology Center and developed decision optimization and computer modeling systems that were successfully deployed in many Fortune 500 companies, including Kraft Foods, Colgate-Palmolive, Nestle, and Airborne Express. He was also instrumental in establishing the first Westinghouse presence on the Internet and was the recipient of two George Westinghouse Signature Awards for Excellence. Steve attained both BS and MS degrees in Electrical Engineering from the Rensselaer Polytechnic Institute.

John Bartels, Chief Technology Officer, has been developing mathematical models for more than 20 years, primarily in biological applications. John provides the technical direction and foundation for Immunetrics’ custom simulation platforms and proprietary tools. Prior to joining Immunetrics, John held senior engineering positions at Nomos Corporation, Westinghouse Electric Corporation, and Digital Equipment Corporation. John holds a B.S. in Computer Science from the Rensselaer Polytechnic Institute and an M.S. in Mathematics from the University of Pittsburgh.

Patricia Rogan, Vice President, Operations, has more than 30 years of experience in executive financial and administrative management at public, private and startup technology companies, including software and biotechnology firms. Prior to joining Immunetrics, Pat was an executive at Innovation Works, Inc., a regional seed stage investor in technology companies. She previously held executive management positions at LaunchCyte, LLC and Dravo Corporation. Pat holds a B.A. and an MBA from the University of Pittsburgh.

John Harn, Biosimulation Platform Manager, oversees the professional services group which develops QSP models for Immunetrics’ pharmacological clients. John has over 25 years of experience in the development of instrumentation and distributed control systems for industrial and laboratory applications. For the past decade, he has specialized in the development of healthcare related applications. Prior to joining Immunetrics, John managed a group that developed instrumentation and laboratory management software for a clinical laboratory that specialized in oncology. John has a B.S. in Electrical Engineering and a B.S. in Computer Science and Applied Mathematics from Geneva College, and a M.S. in Electrical Engineering from the University of Pittsburgh.

Board of Directors

Tom Petzinger, Board Member, is Executive Vice President of Knopp Neurosciences Inc. and CEO of LaunchCyte LLC, a founder of Immunetrics and five other life science companies. He also serves on the boards of Reaction Biology Corp., Crystalplex Corp., and Celsense Inc. Prior to co-founding LaunchCyte, he spent 22 years at The Wall Street Journal in several capacities, including Washington Economics Editor, Deputy Washington Bureau Chief, and weekly columnist. The author of three books, Tom holds a B.S. in journalism from Northwestern University, where he was a Richter Undergraduate International Scholar.

Martin Brecher, M.D., Board Member, is currently the Medical Director of the Family Guidance Center of Warren County. Dr. Brecher was formerly Senior Medical Director at PPD, a top contract research organization. He has over 20 years of experience conducting clinical drug trials and managing drug development. Previously the Chief Medical Officer at SK Life Sciences and a medical science director at AstraZeneca, he led the programs which resulted in new indications for Seroquel for mania, bipolar depression, unipolar depression, generalized anxiety disorder, maintenance treatment in schizophrenia, maintenance treatment in bipolar disorder and a new formulation of Seroquel. Prior to joining industry Dr. Brecher worked at the FDA for two years. He was on the faculty of the Department of Psychiatry at SUNY Downstate for 10 years where he conducted electrophysiological research in schizophrenic patients. Dr. Brecher is a graduate of the MIT and also received a Doctor of Medical Science degree from SUNY Downstate and an MBA from the Wharton School of Business. He has over 30 peer reviewed publications in the fields of electrophysiology and psychopharmacology.