JMT Medical Team


Jeff Rentz, MD, FACS

Founder & CEO - JMT Medical

Jeff founded JMT Medical  to expand his passion and commitment to providing innovative and efficient care to patients.  While practicing in Billings, Montana, Jeff developed procedures that are proven to improve a patient's healing journey.

Jeff is a graduate of University of Virginia Medical School, and trained in surgery at the University of Utah and Harvard University. He has dedicated his career to delivering safer, more effective, and more efficient care for patients.


Doug has over 40 years of experience developing hundreds of products in medical, automotive, consumer and other areas. He has launched numerous successful start-ups with 200+ patents and awards.

Doug Patton - CEO, Patton Design

Morgan McKeown - CEO, Modo Medical

Morgan has more than nineteen years of global management experience in medical device marketing, sales, business development, invention and product launch. He previously worked for Edwards Lifesciences and Key-In Strategies.

Susan Noriega - President and Principal, Regulatory Affairs Compliance Consultants

Susan has more than 40 years of experience in medical device/diagnostic regulatory affairs, clinical and quality assurance with small startup and major medical device companies in the US and internationally totaling over 90 companies. Susan is President and Principal at Regulatory Affairs Compliance Consultants.

Martin Fessenmaier, PhD - Umberg-Zipser, LLC

Martin has a Ph.D. in molecular biology/biochemistry and over two decades of experience in domestic and International patent prosecution, working in the fields of biochemistry and molecular biology, medical devices, bioinformatics, organic chemistry, and general mechanical arts.

William Starshak - Goldberg-Kohn, Ltd

Bill brings over 25 years of commercial law experience to the JMT team. In his practice, Bill represents lenders and equity sponsors with credit facilities, mergers and acquisitions and leverage buyouts.  He has worked on a variety of debt and equity financings throughout the capital stack.  Bill is a renowned expert on international finance transactions and provides JMT with access to a world-wide network of lawyers, consultants and capital providers.

Ross Friedman - Goldberg-Kohn, Ltd

Ross Friedman has over a decade of experience helping startups, emerging companies, private equity firms and family offices navigate complex legal matters, including fundraising and strategic growth. He specializes in equity fundraising as well as mergers and acquisitions, advising clients through every stage of their business journey. Ross combines deep transactional expertise with a practical, approachable style to support companies as they scale and succeed.