First Year Fellows

Luis Gonzalez Corro, MD

Medical School: Latin American School of Medicine
Dr. Luis Gonzalez Corro was born and raised in rural Panama. At the age of 18, he won a full scholarship to study medicine in Havana, Cuba. Medical school graduation brought him another geographical shift, this time to New York City. He completed his residency in the Primary Care and Social Internal Medicine program at Montefiore/Albert Einstein College of Medicine in Bronx, NY. Luis’s research interests include access to HIV and Hepatitis C treatment for impoverished populations with substance use disorders. Given his lived experiences as an Afro-Latinx physician, his additional research interests include the use of social sciences frameworks such as Critical Race Praxis and Anti-racism in HIV care, as well as the intersection of community-based participatory research, research-based advocacy, and its translation to policy. Luis is committed to using medicine as a tool for advocacy, equity, and social justice. In his free time he enjoys running, cycling, and he aspires to become a skillful sailor.

Morgan Walker, MD

Medical School: Louisiana State University Health Sciences Center School of Medicine, New Orleans
Morgan graduated from Louisiana State University School of Medicine and completed her residency in Internal Medicine at LSU Health Baton Rouge, where she also completed a year as a Chief Resident. She is now pursuing a combined fellowship in both Infectious Diseases and Critical Care Medicine. Her research interests are focused on infections in critically ill patients, specifically in the area of novel diagnostic platforms as well as antimicrobial and diagnostic stewardship within the intensive care unit. Outside of medicine, Morgan enjoys spending time with her family back in Louisiana, exploring the Baltimore/DC area, and cheering on the Saints.

Dariusz Hareza, MD

Medical School: Albert Einstein College of Medicine of Yeshiva University
Dariusz, also known as Darek,  was born and raised in the Chicagoland area. His interest in ID started in college at the University of Illinois at Urbana/Champaign where he did research on bacterial chemotaxis and this interest expanded to the intersection of public health/epidemiology and global health. He went to medical school at Einstein in NYC where he went to Uganda twice for research and clinical work. Afterward, he spent time at CDC working on epidemiologic studies at the Injury Center. For his IM residency, he returned home to Chicago and went to the University of Chicago where he was involved in the public health response to COVID-19 at the Chicago Department of Public Health. In his free time, he enjoys eating out in restaurants, having social gatherings with friends, watching the Blackhawks play hockey, stargazing and hiking. He is excited to be back on the East Coast and getting the chance to explore all that Baltimore has to offer!

Joowhan Sung, MD, MSc

Medical School: Yonsei University College of Medicine
Joowhan was born and raised in Seoul, South Korea where he attended medical school at Yonsei University College of Medicine. He then moved to New York City and completed internal medicine residency at Jacobi Medical Center/Albert Einstein College of Medicine. He subsequently worked as a hospitalist at MedStar Southern Maryland Hospital, and during the pandemic, he worked as an active frontline provider and conducted a cohort study on hospitalized COVID-19 patients. He received a Master of Science degree in Epidemiology from the London School of Hygiene and Tropical Medicine, and his thesis focused on estimating the burden of malaria, sickle cell disease, and malnutrition as risk factors for severe anemia among children in Nigeria. He is interested in global health and applying clinical informatics and biostatistical tools to conduct clinical and epidemiological studies. Outside of work, he enjoys playing tennis and trying new restaurants with his wife.

Second Year Fellows

Chelsea Modlin, MD

Medical School:  Geisel School of Medicine at Dartmouth
Chelsea was raised splitting her time between Norwich, VT and Frankfort, MI. She followed the cold weather to Carleton College in Northfield, MN for her undergraduate degree and earned her MD from the Geisel School of Medicine at Dartmouth in Hanover, NH. She then moved south to complete her residency in internal medicine at Emory University in Atlanta, GA. Chelsea’s research interests include the intersection of global health ethics and infectious diseases with a focus on community engagement, health equity in HIV/TB outcomes, research capacity in low-income settings, and the ethical considerations of international academic collaborations. When not at work she enjoys getting outdoors for a hike, sail, or bike ride and investigating the city for the best brunch spot.


Diana Zhong, MD

Medical School:  University of Pittsburgh School of Medicine
Diana grew up in Maryland, studied Biochemistry at the University of Maryland, and earned her MD at the University of Pittsburgh School of Medicine. She did her internship at Washington University in St. Louis then moved to Seattle to complete residency at the University of Washington. She worked as an academic hospitalist at the University of Washington for two years before moving back to Maryland for Infectious Diseases fellowship. Her background includes work with tumor immunology at the National Cancer Institute, as well as the gut microbiome. Her current academic interests include public health, vaccinology, and medical education. Outside of work, she enjoys drawing, designing, writing, cooking & eating, playing & creating games, travel, hiking, and spending time with loved ones including her corgi puppy, Marzipan.


Danica Rockney, MD

Medical School:  University of Wisconsin School of Medicine and Public Health
Danica was born and raised in Black River Falls, Wisconsin. She went to both undergrad and medical school at the University of Wisconsin-Madison and is a Badger through and through. She then moved to Atlanta, GA where she completed her internal medicine residency and chief residency at Emory University prior to moving to Baltimore. Her research interests are in medical education and clinically she is interested in HIV and underserved populations. When not in the hospital, she enjoys cooking, hiking, traveling, and cheering on all the Wisconsin sports teams.


Jerald Cherian, MD

Medical School:  State University of New York Downstate Medical Center
Jerald grew up in Yonkers, NY, a suburb of New York City.  For undergrad, Jerald moved to Brooklyn as part of combined BA/MD program at CUNY Brooklyn College.  He subsequently obtained his MD from SUNY Downstate College of Medicine. Jerald then completed his residency training in Internal Medicine at Vanderbilt University Medical Center.  Jerald’s academic interest is in the intersection of infectious diseases and informatics. He is particularly interested in leveraging the use of informatics to analyze large datasets to study outcomes in patients with infectious diseases, as well as the use of artificial intelligence and electronic clinical support tools to improve management of infectious diseases. He is currently pursuing additional training through the Bloomberg School of Public Health’s Graduate Training Program in Clinical Investigation.  Outside of work, his interests include traveling, hiking, basketball, and baking.

Mentors: Sara Cosgrove, MD and Eili Klein, PhD


Third Year Fellows

Styliani Karanika, MD

Medical School:  University of Athens
Stela grew up in Athens, Greece and studied medicine in the University of Athens. She served as a rural physician in south Crete for one year after her graduation and then worked as a resident in Athens for another year. Next, she joined MD Anderson Cancer Center at the University of Texas as a post-doctoral research fellow. There, she led projects on novel therapeutic approaches for metastatic prostate cancer focused mainly on the DNA damage response, activation of immune signaling and mechanisms of apoptosis in in-vitro and in-vivo models. She then moved to Brown University where she ran epidemiologic studies on C. difficile, MRSA and ESBL gram negative bacteria and was involved in clinical trials investigating novel diagnostic nanotechnology-based molecular assays for the diagnosis of bacteremia and candidemia. Following her research years, she completed her Internal Medicine Residency at Boston University Medical Center. Her current research focuses on novel therapeutic vaccination strategies for TB.  Mentors: Petros Karakousis, MD and Richard Markham, MD


Walid El-Nahal, MD

Medical School:  University of Virginia School of Medicine
Walid was born in Maryland, living in Bowie for the first eight years of his life. He then moved to Cairo, Egypt, where his family is originally from. After ten years there he moved back to the US to begin his undergraduate years at The University of Virginia, where he majored in chemical engineering. He spent twelve years there, completing his undergraduate degree, medical school, and residency at the UVA Health System’s Internal Medicine program. His clinical interests include both HIV and transplant, while his research interests lie in healthcare delivery and how differences in how care is delivered as well as differences in policy impact outcomes for patients with infectious diseases. He is currently working on a project to study the effect of the change from in-person visits to telemedicine during the pandemic on the care of people living with HIV.


Sonya Krishnan, MD

Medical School:  George Washington University
Sonya grew up in Minnesota and obtained her BA in Biology from Carleton College in Minnesota. After college she spent a two years at the NIH studying predictors of IRIS as well as inflammatory markers in Elite Controllers with Dr. Irini Sereti. She then completed her MD at George Washington University and subsequently moved to Baltimore for internal medicine residency at the JHH Osler Medical Training Program. For fellowship research she is working with Dr. Amita Gupta studying host biomarkers of HIV/TB and TB outcomes with particular interest in understanding inflammation pathways, their impacts, and potential therapies. During the 2020-2021 academic year she will also be pursing additional training via the Bloomberg School of Public Health’s Graduate Training Program In Clinical Investigation. Outside of work, she enjoys hiking with her husband and silky terrier as well as gardening.


L. Leigh Smith, MD

Medical School:  Howard University
Leigh grew up in Southern California and received her undergraduate degree from Brown University.  She then moved to DC and received her medical degree from Howard University College of Medicine and ultimately completed residence at Jackson Memorial/University of Miami in Miami, FL.  She spent the last year working as an academic hospitalist where she grew up in California at Loma Linda University Medical Center.  Her clinical interests include outbreak response, disaster & emergency preparedness as well as emerging infectious disease.  She enjoys hiking, running and trying new foods.