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.