Dr. Ashby is a vascular cardiologist and internist who specializes in clinical cardiology, vascular medicine, and general medicine. He was born and raised in South Florida and is of Caribbean descent. Dr. Ashby attended medical school at Cornell University in New York and studied health policy at Princeton University in New Jersey. He completed his internship and residency at Columbia University Medical Center in New York. He completed his cardiology training at George Washington University Medical Center in Washington, DC, where he was named chief fellow. Dr. Ashby also completed a postdoctoral clinical and research fellowship in vascular medicine at Johns Hopkins University in Baltimore, Maryland. He started his career as an academic vascular cardiologist at Mount Sinai Medical Center and professor of Medicine at Columbia University. Dr. Ashby is now CEO of Comprehensive Vascular Care and is a Special Correspondent for MSNBC covering the COVID-19 pandemic and presidential transition.