Leadership and Administration

Dr. Angela Mills

Angela M. Mills, MD, FACEP
Department Chair

Angela M. Mills, MD is the J. E. Beaumont Professor and Chair of the Department of Emergency Medicine at Columbia University Vagelos College of Physicians and Surgeons as well as Chief of Emergency Services for NewYork-Presbyterian (NYP) – Columbia. A national leader and expert in emergency medicine, Dr. Mills graduated with Alpha Omega Alpha distinction from Temple University Medical School and completed the University of Pennsylvania Emergency Medicine residency program serving as Chief Resident. As a University of Pennsylvania faculty member, she advanced academically being promoted to Professor of Emergency Medicine in 2017 and served in several capacities including Medical Director and Vice Chair of Clinical Operations.

In January 2018, Dr. Mills joined Columbia as the inaugural Chair of the newly formed Department of Emergency Medicine leading all academic and operational activities for the four emergency department sites: NYP-Columbia University Irving Medical Center, NYP-Morgan Stanley Children’s Hospital, NYP-Allen Hospital, and NYP-Lawrence Hospital. As Chair, Dr. Mills has worked to successfully advance education, research, clinical care, and diversity and inclusion efforts while building a premier nationally recognized academic department of emergency medicine.

For her accomplishments, Dr. Mills has been honored with a number of prestigious awards including the Arnold P. Gold Foundation Humanism in Medicine Award in 2017 from the Society for Academic Emergency Medicine, the Mid-Career Award from the Academy for Women in Academic Emergency Medicine, and the 2020 Chair of the Year Award from the Emergency Medicine Residents’ Association. Dr. Mills is an elected member of the Society for Academic Emergency Medicine Board of Directors where she currently serves as Secretary-Treasurer. She has authored over 100 scientific publications, has received federal and industry research funding, and has influenced the careers of numerous faculty and trainees.


Dr. Nicholas Gavin

Nicholas Gavin, MD, MBA, MS
Vice Chair, Clinical Operations

Dr. Nicholas Gavin joined the Columbia University Department of Emergency Medicine as Vice Chair of Clinical Operations in January 2019. In this role, he oversees operations at the four NewYork-Presbyterian/Columbia EDs: Columbia University Irving Medical Center, Morgan Stanley Children’s Hospital of New York, Allen Hospital and Lawrence Hospital. Dr. Gavin received both his undergraduate and medical school degrees from NYU and completed his emergency medicine residency at Alameda County Medical Center in Oakland, California where he served as Chief Resident. From 2013 to 2018, Dr. Gavin served as a faculty member of the Department of Emergency Medicine at NYU/Bellevue and from 2015 to 2018, led the NYU Langone Hospital-Brooklyn Emergency Department as Chief of Service. In 2019, Dr. Gavin completed the Cornell University Executive MBA/MS program in Healthcare Leadership.

Dr. Gavin is interested in advancing emergency care as a driver of high quality hospital-based care, as well as a contributor to the broader community’s health.


Dr. David Kessler

David Kessler, MD, MSc
Vice Chair, Innovation

Dr. David Kessler is the Vice Chair of Innovation & Strategic Initiatives in the Department of Emergency Medicine at Columbia University. As Vice Chair of Innovation, Dr. Kessler fosters a culture of innovation and collaboration within the department to help implement novel programs and innovative solutions to complex adaptive systems problems. He is a graduate of Princeton University and Mount Sinai School of Medicine, where he completed his pediatric residency on the global health track. Dr. Kessler completed his Pediatric Emergency Medicine Fellowship and Emergency Ultrasound training at Bellevue Hospital in Manhattan, NY, and his Master of Science in Clinical Investigation at New York University. In 2011, he joined the faculty at Columbia University Irving Medical Center as the Director of Operations of Pediatric Emergency Medicine. Since then, he has helped create several novel programs, such as a curriculum for interprofessional clinical simulation and the fellowship in pediatric emergency ultrasound. Through his role as an Associate Medical Director for the Mary & Michael Jaharis Simulation Center, Dr. Kessler helps other departments start new safety-driven simulation programs.

As a founder and director for INSPIRE, (International Network for Simulation-based Pediatric Innovation, Research, and Education), Dr. Kessler is committed to growing a community of practice dedicated to collaboration, mentorship, and scholarship.


Dr. Penelope Lema

Penelope C. Lema, MD
Vice Chair, Faculty Affairs

Dr. Penelope Lema joined the Department of Emergency Medicine in February 2019 as the Vice Chair of Faculty Affairs and Associate Professor of Emergency Medicine at Columbia University Vagelos College of Physicians and Surgeons. Her dual role is to lead as the Emergency Ultrasound Division Director for the Columbia's Emergency Departments.  Dr. Lema moved back to NYC, her hometown, after residing in Western NY for the past 8 years where she most recently served as the Director of the Emergency Ultrasound Division and Fellowship at the University at Buffalo. Dr. Lema has been a leader in Emergency Ultrasound for over 12 years and was previously the Emergency Ultrasound Director at the University of Rochester (2011 - 2013) and New York Presbyterian Queens (2007 - 2011).  

She received her medical school degree from SUNY Stony Brook School of Medicine and completed her Emergency Medicine Residency and Emergency Ultrasound Fellowship at Northshore University Hospital (currently Hofstra Northwell), where she was elected Chief Resident.

Dr. Lema is a passionate educator, dedicated to faculty professional development and equity in medicine.  She is an avid advocate of the specialty of Emergency Medicine and access to care.  


Dr. Marie Romney

Marie-Laure Romney, MD, MBA
Vice Chair, Quality & Patient Safety

Dr. Marie-Laure Romney joined the Department of Emergency Medicine as Vice Chair of Quality and Patient Safety in November of 2018.  In this role, Dr. Romney oversees quality for the Department’s four ED sites and telemedicine program.  Dr. Romney completed her residency training in Emergency Medicine at NYU Langone Medical Center/Bellevue Hospital Center and an Emergency Ultrasound Fellowship at SUNY Downstate Medical Center. She holds an undergraduate degree from Cornell University, a medical degree from Robert Wood Johnson Medical School, and an MBA from the Wharton School at the University of Pennsylvania.  She is also an alumna of the Clinical Quality Fellowship Program (CQFP), sponsored by the Greater New York Hospital Association (GNYHA) and the United Hospital Fund (UHF).  Prior to joining the team at Columbia, Dr. Romney served as Director of Quality, Continuous Improvement and Patient Safety in the Department of Emergency Medicine at Kings County Hospital.

As a TeamSTEPPS Master Trainer with Lean Management Silver Certification, Dr. Romney enjoys leading interdisciplinary teams to drive meaningful change to help improve healthcare delivery.


Dr. Bernard Chang

Bernard P. Chang, MD, PhD
Vice Chair, Research

Dr. Bernard Chang is the Vice Chair of Research in the Department of Emergency Medicine at Columbia University. Trained as a psychologist and an emergency physician, he has become a national leader on patient and clinician mental health.

As an investigator, he has pioneered the relationships between psychological health and physical health, publishing on the impact of clinician burnout on cardiovascular health in providers. His research on clinician mental health has been supported at the institutional, state, and federal level, and he is currently the Principal Investigator of one of the nation’s largest longitudinal studies on emergency clinician long-term psychological and physical health. His advocacy for clinician well-being has also driven his advocacy efforts at the state and national level.

As a member of the Board of Directors at American College of Physicians-New York Chapter, he has helped stimulate efforts aimed at supporting clinician mental health, while his committee work on the Society for Academic Emergency Medicine has supported research on the bio psychological relationships between medical illness and psychological health. He received his PhD from Harvard in psychology, his MD from Stanford and completed his Emergency Medicine residency training at the Harvard Affiliated Emergency Medicine Residency at Massachusetts General Hospital and Brigham and Women’s Hospital. Prior to going to medical school, he served as a professional sailboat captain and crew doing yacht deliveries internationally.


Headshot of John Babineau

John Babineau, MD​
Chief, Division of Pediatrics

Dr. John Babineau completed undergraduate education at the University of Pennsylvania followed by medical school at Robert Wood Johnson-Rutgers where he graduated with AOA and Gold Humanism Society Honors. After medical school he completed pediatrics residency and then a chief resident year here at NewYork Presbyterian/Columbia during which he received the Physician of the Year-Spirit of Collaboration Award. Dr. Babineau also completed Pediatric Emergency Medicine Fellowship at NewYork Presbyterian/Columbia and in 2013 was awarded the Pediatric Fellow of the Year Award.

Following his fellowship, Dr. Babineau joined the Columbia University Department of Pediatrics faculty and then completed the Greater NY Hospital Association and United Hospital Fund Clinical Quality Fellowship Program in 2016. Dr. Babineau has led multiple successful quality improvement initiatives and has been actively involved in teaching quality improvement methods to both residents and fellows. As a faculty member he participated in the NYP LEAD academy, an 18-month physician leadership training program. In November 2017 he became an Associate Chief Quality Officer at NYP, working to advance quality and patient safety across the spectrum of pediatric care.

Dr. Babineau now serves as the Interim Chief of Pediatric Emergency Medicine in the Department of Emergency Medicine at Columbia University Irving Medical Center.


D. Anne Stewart

D. Anne Stewart, MPA
Department Administrator/CFO

D. Anne Stewart is the Department Administrator/CFO to the Department of Emergency Medicine. She possesses over twenty-five years of progressive experience in academic healthcare. This includes management and oversight of finance, operations, human resources and capital projects, cultivation of client/staff/donor relationships and improving customer service standards.

Prior to joining the Department of Emergency Medicine, D. Anne was the Department Administrator/CFO to the Department of Urology and interim Department Administrator to the Department of Dermatology at Columbia University Medical Center. She began her career in healthcare management at Weill Cornell where she held leadership roles in the Departments of Medicine and Surgery.

D. Anne received her MPA at Baruch College - Zicklin School of Business and is an active member of numerous CUMC and FPO committees, including the Access & Patient Satisfaction Committee and the P&S Staff Diversity Council.

To foster her passion for mentorship and leadership development, D. Anne became a Certified Life Coach and is currently pursuing her M.Ed at Teachers College in Counseling Psychology.