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Medical Toxicology Current Fellows and Alumni

Current Fellows


  • Nate Friedman, MD

    Nate Friedman, MD

    Undergraduate: University of North Carolina at Chapel Hill
    Medical School: Vanderbilt University School of Medicine
    Residency: UCLA


    Dr. Nate Friedman grew up in the suburbs of Washington, D.C. He did his undergraduate studies at the University of North Carolina at Chapel Hill, then went on to medical school at Vanderbilt University School of Medicine after a real-world hiatus. He then moved west to complete residency in emergency medicine at UCLA. He was chief resident in his fourth year, focusing on quality improvement initiatives, and tried earnestly to avoid the tug of academics before succumbing to fellowship in medical toxicology here in San Diego. He is excited to join the illustrious faculty and staff here at UCSD. Outside of the hospital, Nate enjoys all the usual EM activities: hiking with his derpy dog Otis, skiing, and a solid beach picnic. Nate is also a pilot and looking forward to exploring the much-less-congested-than-LA skies of San Diego.

  • Garret Winkler, MD

    Garret Winkler, MD

    Undergraduate: Trinity University
    Medical School: The University of Texas Health Science Center San Antonio
    Residency: The University of Arizona Tuscon


    Dr. Garret "Garry" Winkler is originally from Dallas, Texas. He completed his undergraduate and medical degree in San Antonio, Texas, and then relocated to Boston for a General Surgery Preliminary year. He then completed his Emergency Medicine residency in Tucson where he fell in love with the desert its inherent beauty with the juxtaposition of life and death. He is currently a fellow in Medical Toxicology with a strong interest in the intersection of LGBTQ+ people and Toxicology, recreational drugs, medical education, and LGBTQ+ patient health/advocacy. In his free time, he enjoys cooking, drinking craft beer, and exploring the world with his sassy senior dog, Annie.


Fellowship Alumni Years Where are they now
Sam Ontiveros 2019-2021 Medical University of South Carolina
Priya Srihari 2019-2021 LA County
Tony Gao 2018-2020 UT Health San Antonio
Jenna Otter 2018-2020 Providence Portland Medical Center Emergency Department
Matthew Riddle 2017-2019 UCSD Faculty
Clifford Masom 2017-2019 North Shore University Hospital, New York
Christie Sun 2016-2018 Kaiser Permanente, Long Beach, CA
Richard Adam Koch 2016-2018 Tri-City Medical Center, CA
Dan Lasoff 2015-2017 UCSD / El Centro
Cynthia Koh 2015-2017 Los Angeles
Bryan Corbett 2015-2017 UCSD / El Centro
Charles O'Connell 2013-2015 UCSD / Scripps Green
Janna Villano 2013-2015 UCSD / Sharp Chula Vista
Landen Rentmeester 2012-2014 Wisconsin
Jennifer Cullen 2012-2014 Palomar
Michael Darracq 2010-2012 UCSF Fresno
Jean Lo 2009-2011 Loma Linda 
Steve Thornton 2009-2011 University of Kansas 
Josh Nogar 2008-2010 Long Island Jewish 
Shaun Carstairs 2008-2010 UCSD / Rady's Children Hospital / Camp Pendleton
Alicia Minns 2008-2010 UCSD Faculty
Allyson Kreshak 2008-2010 UCSD Faculty
Sean Nordt 2008-2010 LAC + USC
Alex Miller 2007-2009 Naval Medical Center
Megan DeMott 2006-2008 Pioneers Memorial Hospital
Michael Young 2006-2008 Kaiser Permanente, San Jose
Jennifer Hannum 2005-2007 Wake Forest Baptist Health
Matt Cook 2004-2006 Lehigh Valley Health Network
Mike Matteucci 2004-2006 Naval Medical Center
Rais Vohra 2004-2006 UCSF Fresno
David Betten 2003-2005 Sparrow Hospital
William Richardson 2002-2004 Palmetto Health
Tri Tong 2002-2004 Mission Hospital
Dave Barry 2001-2003 Naval Medical Center, VA
Steve Offerman 2001-2003 Kaiser Permanente, South Sacramento
Stephen Munday 2000-2002 Sharp Rees Stealy
Aaron Schneir 2000-2002 UCSD Faculty
Binh Ly 1999-2001 UCSD Faculty
Marianne Ingels Bacharach 1998-2000 VA Medical Center, Oklahoma City
Cyrus Rangan 1998-2000 LA County Department of Public Health
Saralyn Williams 1994-1996 Vanderbilt University