Executive Staff

David I. Cohen, MD, MSc: Chief Executive Officer, Central Services Organization

Karen Nelson, MD, MPH: Chief Medical Officer, Central Services Organization

Caroline D. Greene, MBA: Chief Administrative and Financial Officer, Central Services Organization


David I. Cohen, MD, MSc

Chief Executive Officer, Central Services Organization

David I. Cohen, MD, MSc is the Chief Executive Officer of the Central Services Organization and is Maimonides’ lead contact for the Delivery System Reform Incentive Payment (DSRIP) program and key Brooklyn initiatives with the NYS Department of Health. Dr. Cohen oversaw the development of the Maimonides-led Performing Provider System (PPS) known as Community Care of Brooklyn (CCB), including the establishment of a broad network of providers committed to meeting the needs of Medicaid beneficiaries across Brooklyn, and the successful completion of the DSRIP planning process. Dr. Cohen is Executive Vice President, Clinical Affairs & Affiliations at Maimonides Medical Center, and is the senior executive responsible for the organization’s population health initiatives, including its Health Home, Care Management, CMMI grant and HARP demonstration project programs, among other roles.

Prior to joining the staff at Maimonides, Dr. Cohen served as Vice President for Medical Operations at the New York City Health and Hospitals Corporation and as Medical Director at Bellevue Hospital Center. Long focused on efforts to advance the use of health information technology to improve quality of and access to care, Dr. Cohen was a founding member of the board of Brooklyn Health Information Exchange (BHIX), one of the first Regional Health Information Organizations. Dr. Cohen is a member of the Housing Works, Inc. board of directors and chairs the board of the Brooklyn Health Home.

Dr. Cohen received his undergraduate and medical degrees from the University of Pennsylvania and received a Masters in Epidemiology and Health from McGill University where he was a Robert Wood Johnson Foundation Clinical Scholar.


Karen Nelson, MD, MPH

Chief Medical Officer, Central Services Organization

Karen Nelson, MD, MPH is the Chief Medical Officer of the Central Services Organization and is responsible for the development, implementation and ongoing oversight of the clinical and care management programs that will ensure the achievement of the PPS’s goals for the DSRIP program. Dr. Nelson is Senior Vice President, Integrated Delivery Systems at Maimonides Medical Center and has served as Executive Director of The Brooklyn Health Home, a NYS-licensed Health Home program comprised of more than 35 care management organizations who provide life-saving services to support very sick and high risk Medicaid patients throughout Brooklyn. Dr. Nelson chairs the PPS’s Care Delivery and Quality Committee, and is the CSO’s primary liaison with Community Care of Brooklyn’s large network of physicians and other providers of primary and specialty care, care management and related social services.

Before assuming her current position at Maimonides in 2012, Dr. Nelson served as the CEO and Medical Director of the Union Health Center, an organization founded by the International Ladies Garment Workers’ Union (ILGWU) at the turn of the 20th Century. The Health Center today is a provider of primary and specialty care for 10,000 mostly immigrant and low-income active and retired union members. From 1996 to 1999, Dr. Nelson was Vice Chair of Medicine at Maimonides, during which time she worked to expand the ambulatory care network and established a community-based training program for residents in Internal Medicine. From 1988 to 1995, she was Medical Director of Dorchester House Community Health Center, a multi-service center in one of Boston’s poorest neighborhoods.

Dr. Nelson has an undergraduate degree from Yale University and graduated from Mount Sinai School of Medicine. She completed her residency in internal medicine at Boston City Hospital and received an MPH degree from Boston University School of Public Health.


Caroline D. Greene, MBA 

Chief Administrative and Financial Officer, Central Services Organization

Caroline D. Greene is the Chief Administrative and Financial Officer of the Central Services Organization, overseeing financial management, information technology, analytics, and reporting. Ms. Greene will establish systems to ensure compliance with the DSRIP contract terms and the achievement of agreed upon goals, including plans to support creation of a sustainable, integrated delivery system that will address the needs of Medicaid beneficiaries across Brooklyn beyond the DSRIP period. Ms. Greene managed the PPS’s capital planning process and chairs the PPS’s Finance Committee, which will participate in the review of DSRIP budgets and funds flow models, and in the development of value-based payment strategies.

Ms. Greene has held leadership positions at a number of health and human services organizations, having served as Chief Financial Officer at the American Civil Liberties Union, Planned Parenthood of NYC and St. Mary’s Healthcare System for Children, and as Vice President for Planning at Cabrini Medical Center and Lenox Hill Hospital. Ms. Greene was the Senior VP for Physician Integration and Managed Care Services at Saint Barnabas Health Care System in NJ, where she led the development of the Saint Barnabas Physician Partnership, obtained designation of 3 SBHCS facilities and their affiliated physicians as participants in the Medicare Provider Partnership demonstration project to test the feasibility of global case payments to encourage collaboration between hospitals and physicians, and developed financial models and plans used to create a self-funded health plan. Ms. Greene served as VP for Network Management at GHI, leading statewide contracting, credentialing and provider relations efforts. Ms. Greene is a member of the boards of directors of the Guttmacher Institute and ThisAbilityNotDisability.org, and is a past president of the NY Society for Health Planning.

Ms. Greene has a BA in Economics from Wellesley College and an MBA in Finance from the Stern School of Business at NYU.