Emergency Medicine

Our Mission: Nassau University Medical Center’s Emergency Medicine residency program is dedicated to developing compassionate and dedicated emergency medicine physicians with exceptional knowledge and skills. We inspire the highest professional standards as clinicians, scholars, and leaders in the field of emergency medicine and the communities we serve.

About us: The Department of Emergency Medicine at Nassau University Medical Center (NUMC) offers an ACGME accredited Emergency Medicine Residency Training Program. It is a four year program accepting six residents per academic year.  With a high volume, high patient acuity, and wide spectrum of illnesses, our residents are provided with an excellent and well-rounded experience.  We have a wide diversity of patient populations and general and specialty care settings.

The highly experienced faculty physicians are committed to providing outstanding patient care in an atmosphere that encourages excellence in teaching.  They are board certified/eligible E.M. physicians with areas of expertise such as toxicology, critical care, neurological emergencies, education, EMS, operations, etc.

The Residency leadership is dedicated to offering the finest quality education and training to ensure the residents achieve excellence as practitioners.  In addition to receiving wide exposure to a variety of clinical specialties at the rotations within NUMC, the E.M. Residents also have the opportunity to work and learn at other area medical centers such as South Nassau Communities Hospital, the NYC Poison Control Center, and Cohen Children’s Medical Center.

Facilities:  Nassau University Medical Center is a public benefit corporation and a 530 bed major academic teaching hospital.  It is Nassau County’s premier Level One Trauma Center, with over 70,000 visits to our Emergency Department each year and more than 300,000 ambulatory visits to our hospital and the outlying health centers.


  • Level One Trauma Center
  • A newly built $36M state of the art Emergency Department which features:
    • 32 patient rooms
    • 2 resuscitation rooms
    • a large 2-bay trauma room
    • the latest in advanced equipment including a 640 slice CT scanner
    • a designated E.D. Ultrasound Room
  • A fully electronic medical record system within the ED which includes electronic tracking board and charting.
  • Over 2000 trauma patients per year
  • Stroke Center – Gold Plus Performance Achievement Award recipient – Awarded by the American Heart Association
  • A new state of the art Burn Center
  • Hyperbaric Center with multi-place Hyperbaric Chamber
  • A Physical Medicine and Rehabilitation Unit recognized for top Press Ganey Satisfaction scores and America’s Best Doctors designation.
  • A new ‘Primary Care Center’ which will provide families with easy and fast access to urgent and primary care services.
  • Home to:
    • The Medical Control of the Nassau County Police Department
    • The Nassau County Fire, Police, and EMS Academy

In addition to providing state of the art emergency care, the Emergency Medicine Department offers:

  • 24/7 Toxicology Services
  • A helipad – we receive more than 50 percent of the area’s most critically injured patients, as well as those with serious acute medical problems via ambulance and helicopter
  • The Coalition Against Domestic Violence
  • Rape Advocacy Program

South Nassau Communities Hospital is committed to providing quality, comprehensive and easily accessible health care services to all residents of Long Island’s South Shore communities in a manner which reflects a culture of excellence with the latest in new innovation and personalized care.  The Emergency Department is the busiest community hospital emergency room in Nassau County.  It is staffed by a team of dedicated professionals which include board certified, residency trained, emergency medicine physicians.  In addition, the nurses, nurse practitioners, and physician assistants have been specially trained in emergency medical care.

It is a Level II Trauma Center, equipped with the advanced medical technology and skilled specialists required to perform emergency trauma procedures.

Other NUMC Residency Programs which rotate at South Nassau Communities Hospital include General Surgery and OB/GYN residents.  The hospital offers a dual AOA and ACGME accredited Family Practice Residency.

The NYC Poison Control Center (NYCPCC) was established in 1955 by the New York City Department of Health. As one of the first poison control centers in the country, it was instrumental in establishing methods whereby poisoning information could be offered as a service to health professionals and to the public. The NYCPCC primarily serves the New York City metropolitan area. In 1955, the center received 2,908 calls; in 1973, 37,000 calls; in 1979, 57,285; and the volume currently exceeds 70,000 calls/year. Approximately 65-70% of the calls are from the public, with the remainder from health care providers. Approximately one-third of the calls are from outside the New York City area.

The NYCPCC has recently completed an expansion and complete renovation of its 3600 square foot facility, including the installation of state-of-the-art computer and phone system. The PCC is housed in the Public Health Laboratories building at 455 First Avenue, which also maintains several of the clinical laboratories for the City of New York. In addition, the NYCPCC maintains a basic science research laboratory and a facility for small animal research, both located in the same building as the NYCPCC itself.

An ACGME fully accredited Medical Toxicology Fellowship is based at the center.

Cohen Children’s Medical Center : US News has ranked Cohen Children’s among the nation’s top children’s hospitals for more than 15 consecutive years. As the largest provider of pediatric health services in the state, Cohen Children’s also serves as New York’s largest Level 1 pediatric trauma center and a primary destination for emergency care. Cohen Children’s Medical Center has been nationally ranked for exceptional care in nine pediatric specialties.

Application Process:      Applicants interested in the Emergency Medicine Residency Program at Nassau University Medical Center should apply through the electronic residency application service (ERAS) starting July 15 for the Osteopathic match. Interviews take place September through January (subject to change).

Essential application information includes:

  • ERAS application form
  • CV
  • Medical Student Performance Evaluation (MSPE)
  • Personal statement
  • At least one Standard Letters of Evaluation (SLOE)
  • Official COMLEX 1 and 2 and/or Step 1 and Step 2 transcripts

If you have any questions, please feel free to contact us:

E.M. Residency Coordinator
Rosemary Cali
Tel 516-296-2899
email:  rcali@numc.edu

E.M. Program Director
Dean Olsen, D.O.
Tel 516-296-2899
email: numcemresidency@gmail.com


Helpful Links:

Nassau University Medical Center Residency Website

Emergency Medicine Resident’s Association (EMRA)

Society for Academic Emergency Medicine (SAEM)

American College of Osteopathic Emergency Physicians (ACOEP)

American Academy of Emergency Medicine (AAEM)

Electronic Residency Application Service


Clinical Curriculum:


PGY-1 Weeks
Emergency Medicine 24 Weeks
Pediatric (Emergency) 4 Weeks
Anesthesia 4 Weeks
Medical ICU 4 Weeks
Internal Medicine 4 Weeks
OB-GYN 4 Weeks
Radiology 2 Weeks
Ultrasound 2 Weeks
Vacation 4 Weeks


PGY-2 Weeks
Emergency Medicine 24 Weeks
Pediatric (Emergency) 6 Weeks
EMS 4 Weeks
Medical ICU 4 Weeks
O.M.F.S. 2 Weeks
Ophthalmology 2 Weeks
Orthopedics 2 Weeks
Vacation 4 Weeks


PGY-3 Weeks
Emergency Medicine 26 Weeks
Pediatric EM 6 Weeks
Community EM 4 Weeks
Surgical ICU 4 Weeks
Toxicology 4 Weeks
Elective 4 Weeks
Vacation 4 Weeks


PGY-4 Weeks
Emergency Medicine 26 Weeks
EM Critical Care 6 Weeks
Pediatric EM 4 Weeks
Medical ICU 4 Weeks
Elective 4 Weeks
Administration 2 Weeks
Research 2 Weeks
Ultrasound 2 Weeks
Vacation 4 Weeks


Although the majority of residency rotations occur at NUMC, the program is structured to ensure residents are exposed to a wide range of pathology and acuity in various settings. For example, residents gain community hospital experience during their rotation at Mount Sinai South Nassau located in the charming town of Oceanside, NY. In addition, residents spend a month learning Toxicology at the New York City Poison Center.

Residents also have the opportunity to select elective experiences to tailor their residency program to meet their educational goals and objectives. Months of electives are offered in PGY3 and PGY4 years. Various elective options are available for residents such as Ultrasound, EMS, Pediatrics, Toxicology, Research, Critical Care, etc.

During the 4th year, our senior residents are given “Resident in Charge” shifts where their primary focus is managing the departmental flow of the ED and the junior residents.

Our Resident Conference is scheduled from 7:30am – 12:30pm. This time is protected from shifts in the ED so that residents can attend conference. Conference consists of lectures, small group work, journal club, procedure skills and more. Below are a few highlights!

EKG – high impact review of foundational and advanced topics in EKG interpretation
Journal Club – critical appraisal of cutting edge literature with expert research faculty
Foundations – our framework to master the in-service exam/boards
Small group work – this can vary from oral board review to procedural skills workshops


Meet our Faculty:

Dean Olsen, DO
Residency Program Director, Department of Emergency Medicine
Assistant Professor, Department of Emergency Medicine and Toxicology, New York College of Osteopathic Medicine, Old Westbury, NY

Lyncean Ung, DO
Assistant Program Director, Emergency Medicine Residency
Adjunct Assistant Clinical Professor, NYIT College of Osteopathic Medicine
Clinical Informatics Fellow, Stony Brook Medicine

Roshan Givergis, DO, MPH
Assistant Program Director, Emergency Medicine Residency
Program Director, Transitional Year Residency

Jessica Berrios, MD
Chair, Department of Emergency Medicine