Our Team

John Clark


John P. Clark, Chairman and CEO – Mr. Clark brings over 30 years of medical sales and business experience as the founder, chairman and CEO of American Radiosurgery. Mr. Clark specializes in the development and commercialization of medical technologies into going corporate concerns. Mr. Clark has purchased technologies and developed patents for various medical applications. Some companies founded by Mr. Clark include; Edmonds Medical Systems, Inc. – A medical manufacturer of patented underwater treadmill devices for the orthopedic rehabilitation market. Clinical Diagnostic Products, Inc. – A company that produced a patented calibrator device for the clinical laboratory marketplace. Medi-Rep Leasing Inc. – A nationally organized financial leasing company. Andros Medical and Lasers Centers – This company operated a private outpatient surgical center in La Jolla, CA specializing in minimally invasive laser discectomy’s. Cosmos Medical Technologies – Is a company that imported European medical laser technologies for development and commercialization in the Western hemisphere. New Laser Science Inc. – A national distribution company specializing in surgical lasers for minimally invasive spine surgery.

Mr. Marc Potvin


Mr. Marc Potvin, President - Marc has 25 years in operations, sales & marketing, engineering, supply chain and held strategic roles throughout the US and globally. 15 years of experience in medical devices, Founder & President at Agility Management Group, a San Diego start-up of Human Resources services. Spent 15 years in the electronics contract manufacturing industry holding several executive leadership roles including sales management, manufacturing operations, and engineering. Worked globally throughout Asia, Europe, and South America developing manufacturing solutions for companies in a broad range of industries including medical, consumer, telecommunication and wireless. Served as a Board member of Connect/SDSI, a business incubator for start-ups.

Mr. Peter Hansen


Mr. Peter Hansen, CFO - Mr. Hanson has over 30 years of experience in the areas of finance and operations. He began his career in public accounting and became a partner with Arthur Young & Company, the predecessor of Ernst & Young. As an audit partner, Mr. Hanson handled a wide variety of clients, both public and privately held. His responsibilities included being the head of the Emerging Business practice for the Boston Office of Arthur Young. After leaving Arthur Young, Mr. Hanson has experienced a wide variety of experiences including serving as Chief Financial Officer for NuCorp Energy and Mitchell International. He also was a principal of Polaris Capital, an investment-banking firm that specialized in leveraged buy-outs. In addition to financial responsibilities, Mr. Hanson also has considerable operations experience as he also served as Executive Vice President of Operations for Mitchell International and more recently as President of the American Association of Franchisees and Dealers.

Tom Silberg

Senior Healthcare Advisor

Thomas H Silberg, Senior Healthcare Advisor - Tom is a seasoned professional in the Pharmaceutical and Biopharmaceutical Industries with substantial executive level experience, including major branded pharmaceuticals, medium-sized biotech, start-up biotech, and generic IV drug manufacturing. Tom has recently retired as CEO and Director of Stemprotein, LLC. A San Diego startup company that produces bioactive stem cell proteins and is currently serving as a senior executive consultant. His most recent experience has been as President and CEO of Genway Biotech, Inc., a custom lab/diagnostic business in San Diego. Previously he was President and CEO of APP North America, a wholly owned subsidiary of Fresenius Kabi, a global healthcare company based in Germany. Prior to the Fresenius acquisition of APP, he served as President and CEO of APP Pharmaceuticals. He has also held COO positions for Tercica, Inc. and Ligand Pharmaceuticals Inc.

Endre Takcas

Chief Technology Officer

Endre Takcas PhD, Chief Technology Officer - Dr. Takacs Serves as a consultant to the corporation in the capacity of Chief Technical Officer. Dr. Takacs Received his Ph.D. from the University of Debrecen, Hungry and established the first Rotating Gamma Institute in Europe at the University of Debrecen. After successfully implementing a state-of-the-art radiosurgery program Dr. Takacs was recruited by Clemson University as a Printable Investigator to serve as an Associate Professor of Physics and Astronomy. Dr. Takacs heads a research lab at the University that is involved with radiotherapy for medical devices and Monte–Carlo simulations. Dr. Takacs has authored numerous publications and lectures at national scientific meetings and his expertise is in Atomic, Molecular and Optical Physics.