Mary Mercer, MD


Mary Mercer, MD, MPH is an associate professor of emergency medicine at the University of California San Francisco. She works clinically at Zuckerberg San Francisco General Hospital and Trauma Center (ZSFG), the only level-one trauma center in San Francisco and the acute care hospital of the San Francisco Department of Public Health (SFDPH). She currently serves as the program director of the Emergency Medical Services (EMS) and Disaster Medicine Fellowship, the EMS Base Hospital Medical Director at ZSFG, the Medical Director of Alameda City Fire Department EMS. Additionally, since early 2020 Dr. Mercer has served in various roles for the SFDPH Covid-19 Response, including early coordination of scarce resources, medical surge preparedness and response across San Francisco hospitals, clinics and EMS system and later as the Covid-19 Vaccine Section Chief, leading the city-wide vaccine distribution strategy.

Dr. Mercer’s experience lays at the intersection of EMS, public health and quality improvement. She previously served as the Director or Performance Improvement and Patient Safety for the Department of Emergency Medicine at ZSFG, leading a number of interdisciplinary improvement efforts for patient access, ED flow, cardiac and neurologic emergencies, substance use disorder, and other conditions. She is also the Co-Principal Investigator for Project FRIEND (First Responder Increased Education and Naloxone), California’s first prehospital naloxone distribution program, now replicated in multiple counties across the state and supported by a grant from the Substance Abuse and Mental Health Services Agency (SAMHSA). In addition to exploring systems’ change and improvement efforts in emergency medicine clinical care, Dr Mercer has national experience in relationship-centered communication education and coaching, lecturing and leading interdisciplinary team workshops on communication and conflict resolution as a facilitator for the Academy of Communication in Healthcare. Additionally, Dr. Mercer evaluates national workforce and patient-centered efforts towards diversity, equity and inclusion in prehospital care and serves as the Chair of the Women in EMS Committee of the National Association of EMS Physicians.

Dr. Mercer completed undergraduate training at Harvard University in the history of science, followed by medical education at Columbia University College of Physicians and Surgeons. She completed emergency medicine residency at Stanford University and EMS/Disaster Medicine fellowship at UCSF/SFGH and received a masters in public health with a focus on epidemiology at University of California Berkeley.


San Francisco's Citywide COVID-19 Response: Strategies to Reduce COVID-19 Severity and Health Disparities, March 2020 Through May 2022.

Public health reports (Washington, D.C. : 1974)

Sachdev DD, Petersen M, Havlir DV, Schwab J, Enanoria WTA, Nguyen TQ, Mercer MP, Scheer S, Bennett A, Tenner AG, Marks JD, Bobba N, Philip S, Colfax G

Implementation of a Leave-behind Naloxone Program in San Francisco: A One-year Experience.

The western journal of emergency medicine

LeSaint KT, Montoy JCC, Silverman EC, Raven MC, Schow SL, Coffin PO, Brown JF, Mercer MP

357 Implementation of a Behavioral Health Paramedic Program for Crisis Navigation.

Annals of emergency medicine

M. Mercer, R. Tsolinas, T. Hong, K. Sporer

Characteristics and Experiences of Women Physicians and Professionals in NAEMSP.

Prehospital emergency care : official journal of the National Association of EMS Physicians and the National Association of State EMS Directors

Staats K, Counts CR, Dyer KS, Stemerman R, Braithwaite S, Luke A, Mercer MP

Quality Management of Prehospital Airway Programs: An NAEMSP Position Statement and Resource Document.

Prehospital emergency care : official journal of the National Association of EMS Physicians and the National Association of State EMS Directors

Vithalani V, Sondheim S, Cornelius A, Gonzales J, Mercer MP, Burton B, Redlener M

Centralized Ambulance Destination Determination: A Retrospective Data Analysis to Determine Impact on EMS System Distribution, Surge Events, and Diversion Status.

The western journal of emergency medicine

Bains G, Breyre A, Seymour R, Montoy JC, Brown J, Mercer M, Colwell C

Emergency medicine services providers' attitudes toward naloxone distribution and training programs.

The American journal of emergency medicine

Montoy JCC, Mercer MP, Silverman EC, Raven MC, LeSaint KT

Financial Incentives to Enhance Participation of Resident Physicians in Hospital-Based Quality Improvement Projects.

Joint Commission journal on quality and patient safety

Chen EH, Losak MJ, Hernandez A, Addo N, Huen W, Mercer MP

Variations in the California Emergency Medical Services Response to Opioid Use Disorder.

The western journal of emergency medicine

Glober NK, Hern G, McBride O, Mercer MP

Reducing Emergency Department Length of Stay.


Mercer MP, Singh MK, Kanzaria HK

A survey of risk tolerance to multiple sclerosis therapies.


Fox RJ, Cosenza C, Cripps L, Ford P, Mercer M, Natarajan S, Salter A, Tyry T, Cofield SS

The Digital EMS California Academy of Learning: One State's Innovative Approach to EMS Fellow Education.

AEM Education and Training

Staats K, Mercer MP, Bosson N, Joelle Donofrio J, Schlesinger S, Sanko S, Kazan C, Brown J, Loza-Gomez A, Eckstein M, Gausche-Hill M

A US National Study of the Association Between Income and Ambulance Response Time in Cardiac Arrest.

JAMA network open

Hsia RY, Huang D, Mann NC, Colwell C, Mercer MP, Dai M, Niedzwiecki MJ

Variations in Cardiac Arrest Regionalization in California.

The western journal of emergency medicine

Chang BL, Mercer MP, Bosson N, Sporer KA

In Reply: Comparing Direct and Video Laryngoscopy for Prehospital Intubation: Can Meta-analysis Provide an Exact Solution?

Academic emergency medicine : official journal of the Society for Academic Emergency Medicine

Brian Savino P, Reichelderfer S, Mercer MP, Sporer KA, Wang RC

Direct Versus Video Laryngoscopy for Prehospital Intubation: A Systematic Review and Meta-analysis.

Academic emergency medicine : official journal of the Society for Academic Emergency Medicine

Savino PB, Reichelderfer S, Mercer MP, Wang RC, Sporer KA

A Novel Survey Tool to Quantify the Degree and Duration of STEMI Regionalization Across California.

Critical pathways in cardiology

Rokos IC, Sporer K, Savino PB, Mercer MP, Shontz SS, Sabbagh S, Hsia RY

Epidemiology of Shortness of Breath in Prehospital Patients in Andhra Pradesh, India.

The Journal of emergency medicine

Mercer MP, Mahadevan SV, Pirrotta E, Ramana Rao GV, Sistla S, Nampelly B, Danthala R, Strehlow AN, Strehlow MC

Physician identification and patient satisfaction in the emergency department: are they related?

The Journal of emergency medicine

Mercer MP, Hernandez-Boussard T, Mahadevan SV, Strehlow MC

Ready or not: does household preparedness prevent absenteeism among emergency department staff during a disaster?

American journal of disaster medicine

Mercer MP, Ancock B, Levis JT, Reyes V

Reducing ambulance diversion at hospital and regional levels: systemic review of insights from simulation models.

The western journal of emergency medicine

Delgado MK, Meng LJ, Mercer MP, Pines JM, Owens DK, Zaric GS