LEADERSHIP

The Firefly Team

Change in healthcare demands vision and persistence. Heart and resilience. Our leadership infuses the Firefly culture with a balance of focused intensity, genuine caring, and earned wisdom.

Our leadership

Fay Rotenberg

Prior to Firefly, Fay initiated Premji Invest’s U.S. healthcare growth equity investments. She co-founded and served as CEO of Mymo, bridging the gap between excess physician capacity and patient demand. Fay was also a partner at LG's venture fund, investing in health and enterprise software companies, and she led AetherWorks’ first spin-off. Fay attended Georgetown University.

Fay Rotenberg
Chief Executive Officer & CEO
Andy Ellner

Andy co-founded Firefly because he believes everyone deserves access to high-quality care. He was the founding co-director of Harvard’s Center for Primary Care and their Program in Global Primary Care and Social Change. He earned his MD from Harvard Medical School and MSc from the London School of Economics. Andy completed his medical training at Brigham and Women’s Hospital.

Andy Ellner
MD, MSc
Chief Clinical Officer
Jeff Greenberg

Before co-founding Firefly, Jeff served as a medical director and primary care physician at Brigham and Women’s Hospital. He was also an assistant professor of medicine at Harvard Medical School. Jeff earned his MD and MBA from the University of Pennsylvania. He completed his medical training at Massachusetts General Hospital.

Jeff Greenberg
MD, MBA
Chief Network Officer
Mimi Liu

Mimi previously built the member experience engineering team at Devoted Health, helping to improve the lives of older Americans. She also led engineering for the electronic health record product line at athenahealth. Mimi earned her BS in Computer Science from MIT. She figured she could hop industries to her heart’s desire but hasn't left healthcare yet — too many problems to solve.

Mimi Liu
Chief Operating and Technology Officer
Brian Lynch

Before joining Firefly, Brian was Aledade’s founding general counsel and senior vice president of legal. He was also a clerk for the 6th Circuit U.S. Court of Appeals, counsel to the governor of Michigan, and worked in Credit Suisse’s Customized Fund Investment Group. Brian earned his JD from the University of Michigan and BS degrees in Economics and Physics from Michigan State University.

Brian Lynch
JD
General Counsel
Kristin Kelly

Kristin was formerly the AVP of family and individual plans at Bright Healthcare, where she led new market selection, product development and implementation, and go-to-market strategy across 16 states. Kristin also worked in consulting and policy for Navigant, MNsure, United Healthcare, and others. She earned her MPH from Tulane University and her BA from the University of Pennsylvania.

Kristin Kelly
MPH
Head of Development & Performance
Evan Wittry

Evan brings a wealth of technology leadership experience from prior roles at athenahealth, RazorInsights, and Navicure. He earned his BS in Computer Science from the University of Georgia.

Evan Wittry
Head of Engineering
Liz Kellogg

Prior to Firefly, Liz was chief marketing officer at Buoy Health, a digital navigation and health benefits marketplace. She built Buoy’s entire marketing function, launching four new products while driving engagement and adoption among employees and consumers. Liz also spent 10 years leading marketing teams at athenahealth. She earned her BA in Philosophy from the University of Vermont.

Liz Kellogg
Chief Marketing Officer
Nisha Basu

Nisha has dedicated her career to providing patients the individualized care and support they deserve. She is a part-time lecturer at Harvard Medical School. Before joining Firefly, she worked as a primary care physician and innovation leader at Beth Israel Deaconess Medical Center. She earned her MD and MPH from Tufts University and studied biomedical engineering at Tulane University.

Nisha Basu
MD, MPH
Medical Director
Sarah Moravick

Prior to joining Firefly, Sarah served as vice president of organizational planning and improvement at Beth Israel Deaconess Medical Center. She also held roles at Massachusetts General Hospital and Blue Cross Blue Shield of Massachusetts. Sarah earned her MBA from Simmons School of Management and her undergraduate degree from Emerson College.

Sarah Moravick
MBA
Vice President of Clinical Services and Operations

Our board of directors

Jonathan Bush

An American technology entrepreneur, Jonathan is best known as the cofounder and former CEO of athenahealth. He is Firefly Health’s executive chairman and a board member at SonderMind and Innovaccer.

Jonathan Bush
Founder & Chief Executive Officer, Zus Health
Nancy Brown

Nancy joined Oak HC/FT in 2014, focusing on growth equity and early-stage venture opportunities in healthcare. She currently serves on the boards of Cricket Health, Firefly Health, Groups Recover Together, Maven, and Unite US. Nancy is also actively involved with Noom, Wayspring, and TurningPoint. Prior investments include Limeade.

Nancy Brown
General Partner, Oak HC/FT
Carl Byers

Carl brings significant operating experience in healthcare IT to his role as Partner. He was on the founding team at athenahealth, where he served as CFO from 1997 to 2010 and led their 2007 IPO. Prior to athenahealth, Carl was a senior consultant in Booz, Allen & Hamilton’s New York office, where he worked in the financial services and health insurance industries.

Carl Byers
Partner, F-Prime Capital Partners & Adjunct Lecturer, Harvard University
Seth Cohen

Prior to OODA Health, Seth was vice president of sales and alliances at Castlight Health, where he led their market partnerships and key national accounts team. He was also on Castlight’s leadership team and currently serves as a board member. Before Castlight, Seth was a management consultant at McKinsey & Company and a founding member of their Center for Healthcare Reform.

Seth Cohen
Co-Founder & CEO, OODA Health
Andy Ellner

Andy co-founded Firefly because he believes everyone deserves access to high-quality care. He was the founding co-director of Harvard’s Center for Primary Care and their Program in Global Primary Care and Social Change. He earned his MD from Harvard Medical School and MSc from the London School of Economics. Andy completed his medical training at Brigham and Women’s Hospital.

Andy Ellner
MD, MSc
Chief Clinical Officer
Fay Rotenberg

Prior to Firefly, Fay initiated Premji Invest’s U.S. healthcare growth equity investments. She co-founded and served as CEO of Mymo, bridging the gap between excess physician capacity and patient demand. Fay was also a partner at LG's venture fund, investing in health and enterprise software companies, and she led AetherWorks’ first spin-off. Fay attended Georgetown University.

Fay Rotenberg
Chief Executive Officer & CEO
Julie Yoo

Julie leads investments in healthcare technology, focusing on companies that modernize how we access, pay for, and experience healthcare. Previously, Julie was the co-founder, chief product officer, and board director at Kyruus, a market leader in patient access. She helped scale the business to reach 20M patients and over 225,000 healthcare providers in the U.S.

Julie Yoo
General Partner, Andreessen Horowitz

Our investors

a16zF-Prime CapitalOak HC/FT