Our Team
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Matthew Riscinti, MD, AEMUS-FPD
Director of System Wide Ultrasound
Senior Fellowship Director
Denver Health Medical Center
Assistant Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2019-2020
Residency: 2015-2019 Kings County/SUNY Downstate, Brooklyn, NYC
My research asks how technology can make point-of-care ultrasound more accurate, accessible, and scalable, pursued through three linked programs: ultrasound-guided regional anesthesia in the emergency department, venous congestion assessment with VExUS (including an AI waveform-interpretation tool I co-developed), and AI-guided ultrasound for austere and resource-limited environments. I have authored or co-authored over 20 peer-reviewed publications, including work in JAMA Network Open, Chest, Critical Care, and Academic Emergency Medicine, and was named SAEM's Most Impactful Researcher in 2025.
This work has been supported by more than $2.2 million in federally funded research. I served as Co-Investigator on a Department of Defense study of lung ultrasound in COVID-19 (2020–2022) and as Co-Principal Investigator on a DoD program (2021–2024) that built and validated deep-learning and teleguidance tools enabling combat medics to perform FAST exams. I am currently a Principal Investigator of an approximately DHS/BARDA-funded prospective clinical trial of a novel 3D ultrasound device for automated diagnosis and triage of musculoskeletal injuries (2025–present), and of a industry-funded study applying 3D ultrasound to thoracic trauma diagnosis (2026–present).
Alongside this grant funding, I lead contracted research with two ultrasound manufacturers. Under an investigator-initiated research agreement with Butterfly Network, my team has studied AI-assisted ultrasound skill retention in novice users and deep-learning cardiac and lung ultrasound, and evaluate new Compass AI and workflow features across our system-wide deployment. Under research and loaner-equipment agreements with Mindray, we completed a validation study of AI tools and launched an emergency department resuscitative transesophageal echocardiography study in 2026.
Many of my new and outstanding projects focus on POCUS for human spaceflight and other austere circumstances.
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Amanda Toney, MD
Pediatric Emergency Ultrasound Fellowship Director
Director of Pediatric Emergency Ultrasound
Staff Physician, Denver Health Medical Center
Associate Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2012-2013
PEM Fellowship: Children’s Hospital Colorado 2009-2012
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Nhu-Nguyen Le, MD, FAEMUS
Fellowship Director, Denver Health Medical Center
Assistant Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2021-2022
Residency: LAC+USC 2018-2022
nhunguyen.le@denverem.org
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Fred Milgrim, MD, FAEMUS
Assistant Fellowship Director, Denver Health Medical Center
Director, Residency Ultrasound Education, Denver Health Medical Center
Associate Director, Longitudinal Ultrasound Curriculum, University of Colorado School of Medicine
Assistant Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2023-2024
Residency: Mount Sinai Hospital 2019-2023
fred.milgrim@denverem.org
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Molly Thiessen, MD
Ultrasound Fellowship Director, Emeritus
Staff Physician, Denver Health Medical Center
Associate Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2011-2012
Residency: Denver Health
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Alexandria Davis
Administrative Assistant
Fellowship Coordinator
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Juliana Wilson, DO
Director Longitudinal Ultrasound Curriculum - University of Colorado School of Medicine
ED POCUS Group lead Co-Chair Anschutz POCUS Committee
Associate Professor, University of Colorado School of Medicine
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Joe Brown, MD, AEMUS-FPD
Assistant Professor, University of Colorado School of Medicine
Fellowship: University of California, San Francisco 2018-2019
Residency: University of California, San Diego
Joseph.R.Brown@cuanschutz.edu
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Ryan Tucker, MD, AEMUS-FPD
Assistant Professor, University of Colorado School of Medicine
Fellowship: Denver Health, 2018-2019
Residency: University of Michigan, 2014-2018
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Michael A. Heffler, MD, AEMUS-FPD
Clinical Instructor, University of Colorado School of Medicine
UCHealth University of Colorado Hospital
UCHealth Highlands Ranch Hospital
Fellowship: Denver Health 2022-2023
Residency: Denver Health 2018-2022
michael.heffler@cuanschutz.edu
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Samuel H. F. Lam, MD, MPH, AEMUS-FPD
Samuel H. F. Lam, MD, MPH
Co-Director of Ultrasound, Children's Hospital Colorado Section of Emergency Medicine
Staff Physician, Denver Health Medical Center
Professor, University of Colorado School of Medicine
Fellowship: Advocate Christ Medical Center
Residency: UMass Medical Center
Hiu.Lam@childrenscolorado.org, HiuFung.Lam@dhha.org
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Julia Aogaichi Brant, MD
Co-Director of Ultrasound, Children’s Hospital Colorado, Section of Emergency Medicine
Assistant Professor, University of Colorado School of Medicine
Fellowship: Denver Health 2018-2019
PEM Fellowship: Children’s Hospital Colorado 2020-2023
Residency: Children’s Hospital Colorado 2013-2016
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Peter Alsharif, MD, AEMUS-FPD
Clinical Instructor, Denver Health
Fellowship: Denver Health, 2024-2025
Residency: Rutgers-NJMS
Peter.alsharif@denverem.org
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Gabe Siegel, MD, AEMUS-FPD
Senior Clinical Instructor, University of Colorado School of Medicine
Fellowship: Denver Health, 2024-2025
Residency: Denver Health, 2020-2024
gabe.siegel@denverem.org
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Jamie Pospishil, MD
Clinical Instructor, Denver Health
Fellowship: Denver Health, 2025-2026
Residency: Kings County/SUNY Downstate, Brooklyn, NYC
jamie.pospishil@denverem.org
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VAUGHN A. BROWNE, MD, PH.D.
Associate Professor of Emergency Medicine at the University of Colorado School of Medicine