The community at Groups begins with the people who deliver treatment every day. Our team is diverse, with a range of personal and professional backgrounds, but we share a set of core values:

  • Purpose: We believe in improving healthcare for the underserved. 
  • Empathy: We are inspired by people brave enough to change their lives.
  • Innovation: We are redefining the way recovery is achieved and measured.
  • Action: We know time is of the essence. 

Management and Board Bios


Dr. Jeff De Flavio, MD, Founder and CEO

Jeff is the founding CEO of Groups. His research focuses on how to expand access to drug treatment in primary care and he has experience leading healthcare teams in resource-constrained settings. Jeff holds an MD from Dartmouth Medical School and an MBA from The Tuck School of Business at Dartmouth. He also holds a B.A. in Philosophy from the George Washington University. Prior to becoming a physician, Jeff worked at a hospital in West Africa, Partners In Health, and a boutique investment bank. 


Joy Sun, Founder and COO

Joy serves as Chief Operating Officer, with responsibility for growth and operations across markets. Prior to joining Groups, she was COO at GiveDirectly, a first-of-its-kind nonprofit that pioneered a new approach to international aid. Joy previously was a manager at McKinsey & Company in the healthcare and agriculture practices, and was Director of Operations at the Clinton Health Access Initiative, where she helped design and implement large-scale HIV treatment programs. She holds an MBA from Stanford Graduate School of Business and a B.S. from Georgetown University.


Silas Howland, Founder and CTO

Silas is the Chief Technology Officer at Groups, overseeing the management and implementation of technology and data systems. Prior to Groups, Silas worked as an operations analyst at a clean energy software startup and as a consultant to a Norwegian technology incubator and data storage company. Silas holds an A.B. in Biological Anthropology from Harvard University and a Graduate Diploma in Entrepreneurial Management from Boston University. He has also written a cookbook, Vegan Is Easy.


Gregg Fairbrothers, President

Gregg taught for over a decade at the Tuck School of Business at Dartmouth College. His wildly popular entrepreneurship class made him a favorite mentor among students. Previously, Gregg founded the Dartmouth Entrepreneurial Network and served as its Director for 14 years. In 2004 he founded the Dartmouth Regional Technology Center (DRTC), Inc. a 55,000 sq. ft. incubator developing technology-based innovations with the potential for significant social impact. 

Mr. Fairbrothers has more than 22 years experience in almost all operational and investment-related aspects of the upstream oil and gas industry, from exploration through IPO. He was President and founder of a mid-sized international oil and gas producer, Samson International. 

Mr. Fairbrothers graduated Dartmouth magna cum laude in 1975 with a B.A. in Earth Sciences. He also earned an M.S. degree from Rutgers University in Geology in 1977, and an MBA from the University of Tulsa in 1983.


Dr. Si France, MD, Founding Board Member

Si is the founder of GoHealth, a national urgent care company. Prior to founding GoHealth, Si was part of McKinsey & Company's Healthcare Services Practice and Health Reform Institute. He oversaw the execution of hospital lean transformation across leading hospital systems and the development of numerous investment theses and diligence assessments for leading healthcare investors. He previously worked at Polaris Venture Partners, the Benaroya Research Institute at Virginia Mason, and served in Congressional Relations within the U.S. Department of the Interior. Si holds an MD from Dartmouth Medical School and an MBA from The Tuck School of Business at Dartmouth.


Dr. Tom Cooper, MD

Tom is a healthcare entrepreneur who has founded a number of outstanding companies, including Spectrum Emergency Care, a national emergency physician company (acquired by Laidlaw), Correctional Medical Services, the largest correctional facility healthcare company in the U.S., and MobileX USA, the largest provider of X-Ray/EKG to nursing homes (acquired by Integrated Health Services).

Tom serves on the board of Elements Behavioral Health, the largest provider of inpatient addiction services in the country. He also serves on the board of TridentUSA Health Services, a leading national provider of bedside diagnostics, laboratory services and hospice care in the U.S. He is the lead director of Kindred Healthcare and Hanger Orthopedics, and a board member of IPC The Hospitalist Company. Tom also serves as an adjunct professor at Columbia Business School, where he has taught courses on entrepreneurship for almost a decade.


Steve Schlafman

Steve is a Principal at RRE Ventures. He is responsible for RRE’s investments in theSkimm, Hightower, TinyBop, Breather, Managed by Q, and Shuddle. Prior to joining RRE as a Principal, Steve was a Principal and rockstar seed investor at Lerer Ventures. Steve regularly teaches at GA and Skillshare, and has been a guest lecturer at Columbia Business School, Wharton, and Harvard Business School.

Before becoming a venture capitalist, Steve worked at Stickybits Inc. and, and served as Director of Venture Investments at The Kraft Group. Steve also worked at Massive Inc. and at Microsoft, where he focused on Biz Dev Strategy and Corporate Finance. He graduated with highest honors from Northeastern University. Outside of the office, Steve enjoys tweeting, ‘gramming, blogging, and spending time with his wife Eliza, an entrepreneur and founder of The Sill.


Stephen Kraus

Stephen is a partner at Bessemer Venture Partners and leads up the firm’s healthcare investing activities. Steve has been recognized by Forbes Magazine as one of the top healthcare investors in the industry. Prior to joining Bessemer, Steve worked for a growth-stage, private-equity firm and as a management consultant at Bain & Company. He has also worked on several different political campaigns throughout his career.

Steve graduated summa cum laude with a B.A. from Yale University and earned his MBA from Harvard, where he was a Baker Scholar. He serves on the board of the New England Venture Capital Association (NEVCA) and the Achievement Network, on the investment committees of BCBS Massachusetts and Rock Health, and as an innovation advisor to Boston Children’s Hospital.