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Photo Credit: Michael Beck, MD

Rolando G. Valenzuela, MD, DTMH
GLobal EM Fellowship Director

Rolando Valenzuela in the Director of the Stony Brook Division of Global Emergency Medicine. He was recruited in 2017 by Dr. William Mallon and Dr. Peter Viccellio to start a fellowship in Global Emergency Medicine at Stony Brook. In 2021 he took the helm of the Directorship of the Division from Dr. William Mallon as he transitioned to Emeritus and well-deserved retirement. Prior to arriving at Stony brook he completed a fellowship of International Emergency Medicine at LA County+USC Medical Center, and was a Fulbright Scholar at the Pontificia Universidad Catolica de Chile. He completed his residency at Rutgers University Hospital in Newark, NJ and received his medical degree from Tufts University. He has worked and lectured in Ghana, Sierra Leone, Haiti, Costa Rica, Guatemala, Peru, Chile, Cuba, Sri Lanka, St. Lucia, Guatemala, and Vietnam.

William K. Mallon, MD, DTMH, FACEP, FAAEM

Dr. William K. Mallon got his undergraduate degree in Biochemistry at McGill University in Montreal, Quebec, and went on to medical school at the University of Massachusetts. From there he went on to the University of Southern California and upon EM residency completion he joined the faculty there. As faculty at USC, Dr. Mallon won numerous teaching awards and was the EM Residency program for a decade (earning the AAEM “Program Director of the Year Award” and successfully developed new curriculum elements and strengthening the program into one the nations’ best (Doximity #1). Dr. Mallon was instrumental in recruiting Mel Herbert MD, Stuart Swadron MD, Diku Mandavia MD, and Maureen McCoullough MD to the program creating a GME powerhouse. Dr. Mallon has won the prestigious ACEP “Outstanding Contribution to Education Award” which has been given to fewer than 40 Emergency Physicians in the history of Emergency Medicine!  


As Dr. Mallon developed increasing focus on international work he received a Fulbright Grant to Iceland, and launched a longitudinal EM development program in Chile. In 2004 he took a sabbatical and earned a Diploma of Tropical Medicine and Hygiene from the Gorgas School in Lima Peru, and spent 7 months in Chile working with both the Universidad de Chile and the Pontificia Universidad Catolica (PUC) in Santiago. Chile now has 10 EM Residencies, 150 residents in training, formal specialty recognition, membership in IFEM and a specialty society (SOCHIMU) of which Dr. Mallon is a founding fellow. Dr. Mallon is considered to be one of the founding fathers of EM in Chile and received a “Lifetime Contribution Award” and “Honorary Diploma” from PUC.

PEter a viccellio md, facep 
vice-chairman, department of emergency medicine

Dr. Viccellio joined the faculty at Stony Brook in 1988. Under his leadership, Emergency Medicine became a Department in the Medical School. He also served as the department’s first residency director. He was appointed Vice Chairman and later Clinical Director of the Emergency Department. Known for his engaging teaching style, Dr. Viccellio received the Aesculapius Award for Excellence in Teaching from the SUNY School of Medicine in 2003. He has instituted a full capacity protocol at Stony Brook University Hospital which has been emulated nationwide, with data demonstrating impact on patient flow, patient safety, length of stay and patient satisfaction. For his efforts, Dr. Viccellio has been awarded the 2005 National ACEP Colin C. Rorrie, Jr. Award for Excellence in Health Policy.

Dr. Viccellio is the editor of Handbook of Toxicology (Lippincott & Raven). His areas of research include emergency department and hospital overcrowding, patient safety, medical errors, head and cervical spine injuries, and residency education.

Gretchen Mockler, MD
Clinical assistant professor

Gretchen Mockler is a Clinical Assistant Professor in the Department of Family, Population and Preventive Medicine at the Stony Brook University Medical Center.  Dr. Mockler studied athropology and linguistics as an undergraduate.  She completed her medical degree at Cornell University Medical College and her residency training in Family Medicine at Columbia University Medical Center, where she then stayed on as a faculty member.  She worked in New York City for several years with a primarily Spanish speaking, Caribbean patient population.   She is fluent in Spanish and French and has spent time professionally in Mexico, Cuba, Nicaragua, India, Madagascar and on the Zuni reservation in New Mexico.  Dr. Mockler's academic interests include research on the vertical transmission of the maternal microbiome and global health. She co-directs the medical Spanish elective for fourth year medical students at Stony Brook Univeristy and is helping to begin a  a multi-center study examining the effects of global health rotations on medical trainees.   She is fluent in Spanish and French.  Dr. Mockler maintains her family medicine practice in the Division of Family Medicine at Stony Brook.

Jonathan KneiB MD, DTMH
International emergency medicine Fellow 2018

Dr. Jonathan Kneib is one of our recent graduates. He is joining us for a joint fellowship, where he will be dividing his time between the Division of Global Emergency Medicine and the Division of Ultrasound. He was born in Nurnberg, Germany on a military base and moved 10 times early in his life. He eventually ended up in La Jolla, California. He attended Tulane University and later transferred to University of California Santa Barbara. He enjoys surfing, scuba diving, and the outdoors.

Benjamin Wyler MD, CTROPMED, MPH
International emergency medicine Fellow 2019

Dr. Benjamin Wyler has received studied medicine at Stanford University and received his MPH from Harvard University. He completed his residency at the historic LA County USC Medical Center, and has practiced in surrounding Los Angeles community hospitals and served as per diem faculty at LAC USC prior to joining the Division of Global Emergency Medicine to pursue his interest in academic and International Emergency Medicine.

priscilla cruZ, MD, DTMH, MPH
International emergency medicine Fellow 2020

Dr. Cruz joined our faculty in 2018 as an Global Emergency Medicine Fellow. She graduated from Medical School in the University of Puerto Rico School of Medicine in 2015 and then went on to complete a three year residency program in Emergency Medicine in the University of Puerto Rico graduating in 2018. During her senior year of residency she served as Journal Club Coordinator. Her areas of interest are International Emergency Medicine and resident education.

mark c. henry md, facep 
chairman, department of emergency medicine

Dr. Henry was one of the first residency-trained and Board Certified Emergency Medicine physicians to practice in New York City and New York State. As a member of the original Regional Emergency Medical Advisory Committee for New York City, he helped develop standards for EMS, 911- receiving hospitals, and specialty referral centers in an EMS system receiving over 1,000,000 calls annually.

Dr. Henry arrived at Stony Brook as Chairman of Emergency Medicine in 1990. He has led the department to national stature in the area of emergency medicine research. An avid EMS researcher,

He lectures nationally and internationally, including Israel, Korea, Portugal and Brazil, on emergency medicine and EMS related topics. Dr. Henry has authored many scientific publications, textbooks, chapters and curricula for emergency medicine and EMS. This includes a comprehensive textbook for Emergency Medical Technicians, “EMT Prehospital Care”. Dr. Henry served as Chairman of the New York State Emergency Medical Advisory Committee and as Medical Director of the EMS Program for the New York State Department of Health for 17 years. During his tenure, research trials, clinical protocols, educational programs, legislative initiatives, and community based EMS programs such as defibrillators in public schools have significantly improved the effectiveness of the New York State EMS System.

Scott weingart md, FACEP, FCCM, FUCEM
division chief critical care emergency medicine

Dr. Weingart received his medical degree and completed a residency in Emergency Medicine at the Mount Sinai School of Medicine. He then went on to fellowships in Trauma, Surgical Critical Care, and ECMO at the Shock Trauma Center in Baltimore.

He is currently an attending in and chief of the Division of Emergency Critical Care at Stony Brook Hospital. He is a clinical associate professor of emergency medicine at Stony Brook Medicine and an adjunct associate professor at the Icahn School of Medicine at Mount Sinai.

He is best known for his podcast on Resuscitation and ED Critical Care called the EMCrit Podcast; it currently is downloaded > 300,000 times per month.

brian wright md, facep, fccm
resuscitation fellowship director

Dr. Wright attended medical school and Emergency Medicine residency at SUNY-Downstate and Kings County Hospital in Brooklyn, NY. After residency, he completed a multi-disciplinary CCM fellowship at North Shore University Hospital in Long Island. Dr. Wright splits his time between EM Critical Care, Neurocritical Care, and Surgical Intensive Care at  Stony Brook University Hospital. Dr. Wright has had the privilege of being honored by his fellows and residents with multiple teaching awards. He is currently the program director of the Advanced Resuscitation Training Program at Stony Brook University School of Medicine and is faculty for the Emergency Medicine residency and Surgical Critical Care fellowship at Stony Brook. His research interests include Neurological Emergencies and in Invasive and Non-Invasive Ventilation strategies.

Michael secko MD, RDMS
division chief& Fellowship DIrector EM Ultrasound

Dr. Secko completed his residency training at SUNY Downstate Medical Center in Brooklyn NY. He then completed a fellowship in EM Ultrasound at Downstate, and went on to become the director of Ultrasound Fellowship at SUNY Downstate, before moving to Stony Brook University Medical Center. He is the Fellowship Director and Division Chief for Ultrasound, and is welcoming fellows in Emergency Medicine Ultrasonography.


Dr. Trevor Marshall completed his residency training at UMass in Worchester, Massachussetts. He then completed a fellowship in EMS at UMS, and went on to become the director of Ultrasound Fellowship at SUNY Sony Brook, where he has directed both volunteer and hospital based prehospital services. He successfully launched a fellowship in EMS at Stony Brook is welcoming his first fellows EMS. He has partnered with the Division of IEM on projects in Chile, St. Lucia, and Colombia

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