Dr. Johnston received her undergraduate degree from Rutgers, the State University of New Jersey. She received early acceptance into the Access Med program at Rutgers, Robert Wood Johnson Medical School in New Brunswick, New Jersey. She received her MD and completed her Internal Medicine Residency there. Dr. Johnston completed her Rheumatology Fellowship at Albert Einstein College of Medicine in Bronx, NY where she served as the chief fellow. Dr. Johnston is fluent in Spanish. She joined the Sarasota Arthritis Center in 2014.