Dr. Marcelin is a Caribbean native born on the island of Dominica. She received her bachelor's degree with a double major in biology and chemistry, and a Diploma in Forensic Science at St. Mary’s University in Halifax, Nova Scotia. She then returned to her second home, Antigua & Barbuda, for medical school at American University of Antigua College of Medicine, after which she then completed her internal medicine residency followed by an infectious diseases fellowship at Mayo Clinic in Rochester, Minnesota. During her time at Mayo Clinic, she was a Chief Infectious Diseases Fellow and founding co-chair of the Mayo Fellows’ Association Trainee Diversity & Inclusion Committee. She is board certified in infectious diseases.

Dr. Marcelin is a passionate advocate for diversity and inclusion and was a founding member of the Infectious Diseases Society (IDSA) Inclusion, Diversity, Access & Equity Taskforce working toward creating a more diverse and inclusive Infectious Diseases specialty. She is also the co-director of Digital Innovation & Social Media Strategy for the Division of Infectious Diseases, and was the inaugural vice chair of the IDSA Digital Strategy Advisory group, highlighting her influence and expertise in social media for healthcare professionals.

Dr. Marcelin is the Vice Chair of Belonging and Community Engagement in the UNMC Department of Internal Medicine. She was previously an Associate Program Director for the Internal Medicine Residency Program where she founded the Extraordinary Culture and Environment Residency Council. 

Clinically, Dr. Marcelin practices infectious diseases and has a special interest in reducing health disparities in infectious diseases and antimicrobial stewardship.