Dr. Kallok is currently Chief Technology Officer of Phraxis, a medical device company developing a unique shunt for vascular access to hemodialysis. He also served as Chief Scientific Officer (2007-09) and CEO (2009-12) there. Prior to Phraxis, Dr. Kallok served as CEO from 2002-07 at Cardiovascular Systems Inc., taking the company from startup status to a market cap of $300 million; he also served as director from 2002-09.

Dr. Kallok has also held positions at Medtronic, Angeion, Myocor, and Boston Scientific, and is founder and president of his own consulting business, Medical Device Consulting, Inc. He holds more than 17 U.S. patents, and has published more than 90 manuscripts, abstracts, and book chapters. At Medtronic, he received the company’s highest technical and management awards—the Bakken Fellowship and Wallin Leadership Award.