To ensure unrivaled medical education, pioneering scientific research, and exceptional patient care, Mount Sinai nurtures a culture of innovative teamwork across the Mount Sinai Health System. In pursuit of this shared mission, the following leaders are among those who have been appointed to the new or expanded roles highlighted below.
Evan L. Flatow, MD
Dean for Clinical Affairs, Icahn School of Medicine at Mount Sinai, and Executive Vice President for Clinical Affairs, Mount Sinai Health System
In his new roles as Dean for Clinical Affairs and Executive Vice President for Clinical Affairs, Evan L. Flatow, MD, is responsible for elevating the voice of physicians and physician leaders in strategy and operations.
Dr. Flatow will ensure the alignment of departmental clinical interests with those of the Health System as Mount Sinai optimizes how the organization provides care. He represents the Health System’s central leadership to physicians, and physicians to central leadership. The clinical chairs and institute directors report to him on clinical matters.
A world-renowned shoulder surgeon who retired from active practice in 2024, Dr. Flatow served as President of Mount Sinai West from 2014 to 2025 and Mount Sinai Morningside from 2023 to 2025.
Adding to his invaluable experience, Dr. Flatow also held the positions of Bernard J. Lasker Professor of Orthopedic Surgery and Chair of the Leni and Peter W. May Department of Orthopedic Surgery at the Icahn School of Medicine at Mount Sinai as well as Director of the Orthopedic Surgery Service at The Mount Sinai Hospital.
Dr. Flatow earned his medical degree from Columbia University College of Physicians and Surgeons. He completed a surgical residency at Roosevelt Hospital and an orthopedic residency and fellowship at Columbia-Presbyterian Medical Center.
Dr. Flatow has received numerous honors and awards, and he has written or edited five books as well as more than 170 articles and book chapters. He has served as President of American Shoulder & Elbow Surgeons, Chair of the Trustees of the Journal of Shoulder and Elbow Surgery, and as Chair of the Publications Committee and of the Council on Education of the American Academy of Orthopaedic Surgeons.
Tracy L. Breen, MD, FACP
President and Chief Medical Officer, Mount Sinai Morningside and Mount Sinai West
Tracy L. Breen, MD, FACP, is President and Chief Medical Officer of Mount Sinai Morningside and Mount Sinai West. She oversees safety, quality, and clinical care and works closely with leaders across the Health System to implement strategic priorities at these two hospitals.
For more than a decade, Dr. Breen has played a key role at the two hospitals. She became Chief Medical Officer for Mount Sinai West in 2014 and added Mount Sinai Morningside to her responsibilities in 2023.
A diabetes specialist, Dr. Breen is also Professor of Medicine (Endocrinology, Diabetes and Bone Disease) at the Icahn School of Medicine at Mount Sinai. She first joined Mount Sinai in 2005 as a faculty member in endocrinology at The Mount Sinai Hospital, and a year later became Clinical Director of the Mount Sinai Diabetes Center.
Dr. Breen earned her MD and completed an internal medicine residency at New York University Grossman School of Medicine, where she served as Chief Resident. Her residency was followed by an NIH-funded research fellowship in endocrinology, diabetes, and metabolism at Columbia University Vagelos College of Physicians and Surgeons.
She is a Fellow of the American College of Physicians, a member of the American College of Healthcare Executives, and a faculty mentor for Stanford University’s Master of Science in Clinical Informatics Management program.
Alexander Charney, MD, PhD
Director, The Charles Bronfman Institute for Personalized Medicine, Vice Chair, Windreich Department of AI and Human Health, Mount Sinai Health System
Alexander Charney, MD, PhD, is Director of the Charles Bronfman Institute for Personalized Medicine at the Icahn School of Medicine at Mount Sinai and Vice Chair of the Windreich Department of AI and Human Health. In these roles, he brings together Mount Sinai’s experts in clinical, biological, and data sciences to collaboratively design and conduct research that translates into experimental interventions and new standards of care for the full spectrum of medical conditions.
The flagship program of the Institute is the Mount Sinai Million Health Discoveries Program, which Dr. Charney founded and leads. Through the program, Dr. Charney and his team are sequencing the genomes of one million Mount Sinai patients. The clinical genomic database emerging from the program is one of the most powerful sources of knowledge on human health in history and positions Mount Sinai as a central force driving the evolution of learning health systems.
Dr. Charney is Associate Professor of Psychiatry; Artificial Intelligence and Human Health; Genetics and Genomic Sciences; Neuroscience; and Neurosurgery. He is a physician-scientist specializing in the genetic architecture of mental illness, and his work is focused on translating genomic discoveries into early-phase clinical trials of novel therapeutics.
Additionally, Dr. Charney emerged as a leader of Mount Sinai’s research response during the COVID-19 pandemic. He is the primary investigator on Mount Sinai’s successful bid to become a site for RECOVER, the National Institutes of Health initiative to characterize the long-term health effects of COVID-19.
Dr. Charney earned his MD and PhD at the Icahn School of Medicine and completed his residency in psychiatry at Mount Sinai.
Nicholas Gavin, MD, MBA, MS
Vice President, Chief Clinical Innovation Officer, and
Associate Chief Medical Information Officer for Digital Health, Mount Sinai Health System
As Vice President, Chief Clinical Innovation Officer, and Associate Chief Medical Information Officer of the Mount Sinai Health System, Nicholas Gavin, MD, MBA, MS, leads a newly formed team whose goal is to identify and test how the delivery system can be redesigned. Working with key partners across the Health System, Dr. Gavin’s team seeks out the best ideas and practices, breaks down any silos constraining them, and implements them systemwide in a consistent and thorough way.
Key areas of focus include shifting inpatient care to the ambulatory or home setting, partnering with technology companies seeking to use the Health System as a learning laboratory, and bringing rigor to the testing of delivery system innovations. The team will prioritize ideas that can reduce the cost of care, enhance the patient experience, optimize operational efficiency, and improve clinical quality.
Throughout his career, Dr. Gavin has sought ways to use technology and informatics to help patients and clinicians. At Mount Sinai, he led the development of Virtual Urgent Care and Message Only Care—rapidly growing virtual care options that allow patients to receive high-quality, on-demand care wherever they are.
Dr. Gavin joined Mount Sinai as Vice Chair of Population Health and Clinical Innovation in the Department of Emergency Medicine, then became the Department's Vice Chair of Clinical Operations. Before joining Mount Sinai, Dr. Gavin held leadership roles in emergency medicine at Columbia University and NYU Langone.
He earned his MD at NYU, completed an MBA and MS in health care leadership at Cornell University, and did his residency in emergency medicine at Alameda County Medical Center in Oakland, California, where he served as Chief Resident.
Paul J. Kenny, PhD
Interim Director, The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai
Paul J. Kenny, PhD, is the Ward-Coleman Professor in Pharmacology and Experimental Therapeutics, Chair of the Nash Family Department of Neuroscience, and Director of the Marie-Josée and Henry R. Kravis Drug Discovery Institute of the Icahn School of Medicine. He is serving as Interim Director of The Friedman Brain Institute at the Icahn School of Medicine at Mount Sinai.
Dr. Kenny is a renowned researcher in the study of the neurobiology of drug addiction, mood disorders, schizophrenia, and obesity. As Interim Director, Dr. Kenny oversees the integration of neuroscience research across Mount Sinai; promotes interdisciplinary collaborations to advance understanding of the brain in health and disease; directs the brain-related education of doctoral and postdoctoral trainees, and the mentoring of medical and graduate students, postdoctoral fellows, and clinical residents; and guides efforts to develop new diagnostics, treatments, and preventive strategies for neurological and psychiatric conditions.
Dr. Kenny is deputy editor of Biological Psychiatry and has served as a senior editor for the Journal of Neuroscience. He has also served as a member of the National Advisory Council on Alcohol Abuse and Alcoholism, the National Advisory Council on Drug Abuse, and the National Institutes of Health Council of Councils.
Dr. Kenny earned his bachelor’s degree in biochemistry from Trinity College Dublin and a PhD in neuropsychopharmacology from King’s College London.
Joshua Kugler, MD, MHCM
Vice President of Integration, Mount Sinai Health System
As Vice President of Integration, Joshua Kugler, MD, MHCM, oversees efforts across the Health System designed to ensure patients receive high-quality, well-coordinated care at any Mount Sinai site.
Dr. Kugler brings decades of experience at Mount Sinai South Nassau to this expanded role, having served as the Chair of the Department of Emergency Medicine, Chief Medical Officer, and, since 2022, Vice President of Administration and Physician Services. Dr. Kugler collaborated closely with the ambulatory team at the hospital to align the hospital’s clinical programs with Mount Sinai Health System. He also played a key role in establishing Mount Sinai’s academic and clinical partnership with Richmond University Medical Center on Staten Island.
Dr. Kugler earned his MD at the University of Pittsburgh School of Medicine and trained in general surgery at the National Naval Medical Center-Bethesda. He completed his training in emergency medicine, serving as chief resident at NYU-North Shore University Hospital. A United States Navy veteran and graduate of the Naval Aerospace Medical Institute, Dr. Kugler completed the Master in Health Care Management program at Harvard University.
Board certified in emergency medicine, Dr. Kugler serves as Chair Emeritus for the Department of Emergency Medicine at Mount Sinai South Nassau. He is also a Diplomate of the American Board of Emergency Medicine and a Fellow of the American College of Emergency Physicians.
Jolion McGreevy, MD, MBE, MPH, MBA
Deputy Chief Clinical Officer, Mount Sinai Health System
As Deputy Chief Clinical Officer for the Mount Sinai Health System, Jolion McGreevy, MD, MBE, MPH, MBA, leads efforts to standardize delivery of clinical care to improve patient safety, outcomes, and experience. Dr. McGreevy works to integrate functions across the Health System and improve efficient use of resources. He also oversees clinical ethics services, coordinating consultations to resolve ethical issues and reduce related distress encountered by patients, families, and staff.
His goal is to develop care models that are ethically grounded and focused on advancing health equity. Dr. McGreevy gains insights directly from patients and front-line caregivers, using their observations to address systemic barriers and align innovations in care delivery with advances in medical science.
Dr. McGreevy was previously Chief Medical Officer of Mount Sinai Beth Israel. Prior to that, he served as Interim System Chair of Emergency Medicine and as that Department's Vice Chair and Vice President for Clinical Operations. During the COVID-19 pandemic, he was Medical Director of the Emergency Department at The Mount Sinai Hospital. An Associate Professor of Emergency Medicine at the Icahn School of Medicine at Mount Sinai, Dr. McGreevy is a past Chair of the Ethics Committee of the Society for Academic Emergency Medicine.
Dr. McGreevy earned his MD from Jefferson Medical College and completed his Master of Bioethics at the University of Pennsylvania, his Master of Public Health at Johns Hopkins University, and his Master of Business Administration from New York University. He was a National Institutes of Health Fogarty International Clinical Research Scholar. Dr. McGreevy completed his residency in Emergency Medicine at Boston Medical Center/Boston University School of Medicine.
Sarah E. Millar, PhD
Dean for Academic and Scientific Affairs, and Chair, Department of Stem Cell Biology and Regenerative Medicine, Icahn School of Medicine at Mount Sinai
Sarah E. Millar, PhD, the Lillian and Henry M. Stratton Professor of Gene and Cell Medicine and Director of the Black Family Stem Cell Institute, is now Dean for Academic and Scientific Affairs for the Icahn School of Medicine at Mount Sinai. In this role, she works closely with institutional leaders to achieve strategic goals in basic, translational, clinical, and community-based research.
She is also inaugural Chair of the newly established Department of Stem Cell Biology and Regenerative Medicine, consolidating the Department of Cell, Developmental and Regenerative Biology and the Institute for Regenerative Medicine. Under her leadership, the Institute for Regenerative Medicine created or expanded several Centers, including a new NIH-funded Mount Sinai Skin Biology and Diseases Resource-Based Center.
Dr. Millar is Professor of Stem Cell Biology and Regenerative Medicine, Oncological Sciences, and Dermatology. She is a renowned researcher in epithelial development and stem cell biology. Her team has made seminal discoveries on the roles of cell-cell signaling pathways and epigenetic regulatory mechanisms in development and regeneration of the skin and its appendages. She brought this research expertise to her tenure as Dean for Basic Science from April 2024 to July 2025.
After graduating from Cambridge University, Dr. Millar earned her PhD in molecular biology from Imperial College, London University, and then trained as a postdoctoral fellow at the National Institutes of Health and at Stanford University. She is a graduate of Drexel University's Executive Leadership in Academic Medicine Program. Prior to joining Mount Sinai in 2019, Dr. Millar was an endowed Professor and Vice-Chair of the Department of Dermatology at the University of Pennsylvania.
Dr. Millar is President-Elect of the Society for Investigative Dermatology, Editorial Board member for Developmental Cell and Experimental Dermatology, and Senior Editor for the Journal of Investigative Dermatology.
Girish N. Nadkarni, MD, MPH, CPH
Chair, Windreich Department of Artificial Intelligence and Human Health, Icahn School of Medicine at Mount Sinai; Director, Hasso Plattner Institute for Digital Health, Mount Sinai Health System; and Chief AI Officer, Mount Sinai Health System
An innovative physician-scientist, Girish N. Nadkarni, MD, MPH, CPH, is a pioneer in artificial intelligence (Al) and its clinical translation, ensuring that Al approaches are safe, effective, and equitable. As Chair of the Windreich Department of Artificial Intelligence and Human Health of the Icahn School of Medicine at Mount Sinai, Director of the Hasso Plattner Institute for Digital Health at Mount Sinai, and Chief AI Officer, he leads Al and machine learning research, clinical translation, and integration into operations to generate breakthroughs, optimize health care delivery, and support clinical decision making.
The Irene and Dr. Arthur M. Fishberg Professor of Medicine at the Icahn School of Medicine and Chief AI Officer for the Health System, Dr. Nadkarni also co-leads the Mount Sinai Million Health Discoveries Program, the initiative integrating one million Mount Sinai patients’ genetic data with a wide range of other data sources. Dr. Nadkarni was previously Co-Director of The Charles Bronfman Institute for Personalized Medicine and inaugural System Chief of the Division of Data-Driven and Digital Medicine within the Department of Medicine. He has made major contributions to the application of Al in medicine and the advancement of precision medicine.
Holder of numerous patents, Dr. Nadkarni co-invented the first Food and Drug Administration-approved Al bioprognostic. He is the scientific co-founder of Renalytix, whose technology allows clinicians to understand patient risk for progressive decline in kidney function at the earliest stages of diabetic kidney disease.
A prolific researcher, Dr. Nadkarni has authored or co-authored numerous peer-reviewed publications in leading scientific and medical journals.
Dr. Nadkarni earned undergraduate degrees in medicine and surgery at Topiwala National Medical College in Mumbai, India, and a Master of Public Health from the Johns Hopkins Bloomberg School of Public Health. He completed his residency in internal medicine and a fellowship in nephrology and precision medicine at the Icahn School of Medicine.
Scott Russo, PhD
Director, Brain-Body Research Institute, Mount Sinai Health System
Renowned neurobiologist Scott Russo, PhD, is the inaugural Director of the Brain-Body Research Institute at Mount Sinai, a cross-departmental resource focused on holistic approaches to science and medicine. The Institute seeks to gain a better understanding of how the brain and body interact in health and disease, ultimately leading to improvements in overall health while promoting healthy living and longevity.
Dr. Russo is Professor of Neuroscience, Psychiatry, and Immunology and Immunotherapy in the Nash Family Department of Neuroscience and The Friedman Brain Institute at the Icahn School of Medicine at Mount Sinai. Internationally recognized for his contributions to understanding the neural and immunological basis of neuropsychiatric disorders, Dr. Russo led translational studies of the immune system in depression that have changed the way mental illness is understood. His studies are also providing an increasingly detailed understanding of the mechanisms by which disturbances in immunity lead to changes in complex behavior.
A Kavli National Academy of Science Frontiers Fellow and American College of Neuropsychopharmacology Fellow, Dr. Russo earned his PhD in psychology from the City University of New York. He then completed postdoctoral work in psychiatry and psychology at the University of Texas Southwestern Medical Center before joining the Icahn School of Medicine.
Elizabeth Sellman, MPA
Executive Lead for the Transformation Office, Mount Sinai Health System
Elizabeth Sellman, MPA, is Executive Lead for the Mount Sinai Health System’s Transformation Office. In this new role, Ms. Sellman focuses on aligning and strengthening operations, finances, and culture—helping teams across the Health System navigate change while maintaining Mount Sinai’s commitment to delivering world-leading health care to the patients and communities served.
She was previously President and Chief Operating Officer of Mount Sinai Downtown. Prior to that, she served as Senior Vice President and Chief Operating Officer of Mount Sinai Beth Israel. Throughout her tenure at Mount Sinai, Ms. Sellman has met challenges with compassion, professionalism, and strategic clarity. She brings broad experience and deep understanding of the organization to bear, and she will work closely with senior leaders to guide Mount Sinai in meeting its goals and fulfilling its mission.
Ms. Sellman holds a Bachelor of Arts in Psychology from the University of South Florida and a Master of Public Administration-Health Administration from Long Island University.
Lisa S. Stump, MS, FASHP
Chief Digital Information Officer, Mount Sinai Health System, and Dean for Information Technology, Icahn School of Medicine
As Chief Digital Information Officer of the Mount Sinai Health System and Dean for Information Technology of the Icahn School of Medicine at Mount Sinai, Lisa S. Stump, MS, FASHP, plays a key role in planning and directing the implementation of a comprehensive enterprise digital ecosystem. She drives innovation in collaboration with Health System leaders and faculty while ensuring integration of new technologies that create value and drive growth.
Ms. Stump brings deep informatics expertise to her executive position, with experience in both clinical and academic environments. She serves as a bridge between the clinical, educational, and research missions of the enterprise. She leads the effort to further strengthen Mount Sinai’s digital strategy, with major areas of responsibility including core information technology and digital functions, cybersecurity and risk, data privacy and governance, application portfolio management, data democratization, the digital experience, data and analytics, and artificial intelligence and machine learning.
Ms. Stump graduated from the University of Connecticut School of Pharmacy and The Ohio State University College of Pharmacy with a Master of Science in Health-System Pharmacy Administration and Leadership. She is a Fellow of the American Society of Health-System Pharmacists (FASHP) and is the inaugural Chair of the ASHP Section of Digital and Telehealth Providers.
Vincent Tammaro
Executive Vice President and Chief Financial Officer, Mount Sinai Health System
Vincent Tammaro brings 30 years of experience in hospital and health care financial management to his position as Executive Vice President and Chief Financial Officer for the Mount Sinai Health System. As such, Mr. Tammaro plays a key role in planning and directing the financial oversight of the Health System.
Mr. Tammaro partners with senior leaders across the Health System to define strategic direction and executes key financial initiatives. His responsibilities include general and cost accounting, financial reporting, audit, treasury, accounts payable, payroll, insurance, investments, grants, endowments, funds flow, capital and operating budget, financial planning and analysis, business intelligence, purchasing, supply chain, revenue cycle, and managed care.
Before joining Mount Sinai, Mr. Tammaro served as CFO of The Ohio State University Wexner Medical Center in Columbus, Ohio. He previously spent 20 years in increasingly responsible roles at Yale-New Haven Health, including serving as CFO and Treasurer.
In addition to his leadership responsibilities at Mount Sinai, Mr. Tammaro serves as treasurer of Project Reach, a nonprofit dedicated to erasing the stigma of addiction and mental health issues.
Mr. Tammaro earned his Bachelor of Business Administration in Public Accounting from the Pace University Lubin School of Business.
