Skip to main content
Learn More About Proton Therapy
Learn More About Proton Therapy


Joseph K. Jachinowski

Executive Director

With more than thirty years of experience in the field of oncology, Joe brings an unmatched depth of expertise and experience to our company. He served as Mevion’s chief executive officer and president from 2009 to 2018. Since joining the company, Joe oversaw the development of industry-leading technologies and our growth into a leading global provider of proton therapy systems.

Joe cofounded IMPAC Medical Systems and served as its president and chief executive officer from 1990 through the company’s initial public offering and sale to Elekta in 2005. After the sale, Joe was an executive vice president of Elekta for four years running global R&D and North American commercial operations. Joe began his career at Varian Medical Systems, Inc., where he led the team that developed linear accelerators from 1983 to 1990.

He holds a Bachelor of Science from Ohio University and Master of Science from Washington State University.