Meet Our Leadership
Cooper Zelnick
Chief Executive Officer
“When anyone, anywhere reaches out for help with addiction, help should be there. I joined Groups to bring that help to those who need it most.”
Cooper has spent nearly a decade leading Groups, serving in key roles including President and Chief Strategy Officer before becoming CEO. He knows the organization from the ground up and has been instrumental in its growth and national expansion. Cooper brings a rare combination of deep operational experience, strategic vision, and a personal commitment to Groups’ mission.
Before joining Groups, Cooper was an investor at RRE Ventures in New York, where he focused on behavioral health and healthcare services. He holds a BA in English and History from Williams College, graduating magna cum laude. His passion for improving access to compassionate, high-quality care is what drew him to Groups and continues to drive his work today.
Dr. Jacob “Gus” Crothers, MD
Chief Outcomes and National Medical Director
“I came to Groups Recover Together because I loved the mission and the model of care delivery. The treatment model is high quality, cost effective, and reaches individuals who have historically been shut out of the medical system. At its core, our mission is one of social justice, and that really speaks to me. This is a rapidly evolving field of medicine and I love that Groups is at the forefront of innovation.”
Dr. Crothers completed medical school at Tufts University School of Medicine and residency training at Tufts University Family Residency at Cambridge Health Alliance. While there he designed and implemented a resident-led group visit model for treatment of opioid use disorder (OUD). The program continues to serve as a national model for integrating addiction medicine education into residency training. Following residency, he pursued his Addiction Medicine board certification at the APT Foundation in New Haven Connecticut, a Yale-affiliated organization where many of the original studies of Suboxone were completed. While continuing to practice part-time addiction medicine, Dr. Crothers served as Medical Director of Grand Rounds, where he scaled their clinical products to over 5 million covered lives in his 5 years of tenure.
April Boss
Chief Financial Officer
“The Groups members I’ve met are incredible people who have often lost everything to opioids. Yet they find the strength to recover. You can’t help but be inspired and want to fight for them.”
April is an experienced finance executive who has focused much of her career on healthcare, specifically on outcome-based models. April has held leadership positions at Iora Health (now One Medical), Fresenius, Care.com, and Amazon. She began her career in public accounting at KPMG. She holds an MSA and B.S. from Babson College and is a CPA licensed in Massachusetts.
Earl L. Della Barca
Chief Compliance Officer and Corporate Counsel
“Groups Recover Together’s focus is on its members. I am excited to help Groups navigate various federal and state requirements so that it can continue to provide high-quality services to those who need it most.”
Earl is an experienced healthcare attorney and compliance officer and has spent much of his career focused on Medicaid and behavioral health. He started his career at a national law firm representing pharmaceutical companies in numerous lawsuits and government investigations. He then served as the Director of Compliance and Regulatory Affairs for a national Medicaid MCO. After that, he was the Compliance Director, Privacy Officer, and General Counsel for a regional Medicaid MCO. He comes to Groups after serving as an Associate General Counsel at a national hospital management system. Earl received his J.D. from Drexel University.
Ari Rosner, LCSW
Chief Clinical Officer
Ari is a Licensed Clinical Social Worker who leads the Care Design and Innovation team at Groups. In her role, she’s focused on building and improving the care model while ensuring clinical excellence. Before Groups, Ari led behavioral health and social care strategy at Cityblock Health, where she was part of the founding team. Both roles have been opportunities for her to help build truly integrated, team-based care models for a population she cares about deeply. Previously, she directed the Mount Sinai Health Home, comprising of contracted community-based agencies that provide comprehensive care management services to New York State Medicaid recipients with chronic illness and social care needs. Prior to this position, she worked at Mount Sinai Hospital as a Renal Transplant Social Worker, evaluating patients for transplant from a psychosocial perspective and supporting them through the process. Ari has a B.A. from Brandeis University, received her M.S.W. from Columbia, and was faculty at the Icahn School of Medicine at Mount Sinai. She lives in Brooklyn with her family, loves to travel, eat, and has yet to meet a beach she didn’t like.
Our Investors
