The Georgetown Downtown Campus

  • GTDT 2018

    GTDT 2018

    Welcome, GTDT Class of 2018

  • flipping


    Flipping the classroom with Dr Myers...

  • Making the most of Explorations...

    Serving others...

    Putting the Explorations class to use

  • teaching


    Dr Marina Castilla is Team Leader and faculty instructor at GTDT...

Welcome to the GTDT campus of the SMP!

While all of the academic content and advising is the same as the GUMC campus, there are a few unique aspects of the GTDT SMP.

We look forward to working with you, and helping you achieve your goals in medicine.

Accepted Students

On-Site Faculty

Marina Castilla, MD

Dr. Marina Castilla graduated from the University of Maryland School of Medicine in 2011. She has taught undergraduate and graduate anatomy and physiology courses at George Mason University as part of the GeorgeSquared Biomedical Sciences Programs.

Dr. Castilla is an SMP Team Leader, and provides daily oversight of the GTDT SMP campus. She teaches Principles of Gross Anatomy and Advanced Pathophysiology as well as the non-cadaveric gross anatomy lectures for the Cardiopulmonary, GI, and Sexual Development & Reproduction medical courses at the GTDT campus.



Holly Frost, MS

 Holly Frost, MS, NR-P, received her MS in Physiology from Georgetown University in 2001, and is an instructor at the GTDT campus. A long-time paramedic, she has additionally been a health and medicine educator for over 25 years.  She is also a former assistant dean of emergency medical services, and is an exceptional resource for our students. Her favorite topics to teach are pathophysiology, gross anatomy and forensic medicine.


Michael Nelson, MS

NelsonMichael Nelson, M.S., is an instructor at the GTDT campus. He received his M.S. in Physiology from Georgetown University. Michael received an undergraduate degree in Chemistry, Kinesiology & Sport Science, and Spanish as well as his M.A. in Science Education from the University of South Dakota. As a former teacher and SMP alum, he is dedicated to pushing his students to excel in their rigorous biomedical coursework and continue on to successful careers in medicine.