Dr. Justine Ko earned her undergraduate degree and medical degree at Case Western Reserve University. She completed her emergency medicine residency at McGaw Medical Center of Northwestern University, where she also served as chief resident during her final year. She went on to complete subspecialty training in sports medicine at MedStar Health/Georgetown University, where she participated in care for Gallaudet University and Georgetown University athletes.

Dr. Justine Ko is currently an Assistant Professor of Clinical Emergency Medicine at Weill Cornell Medical College and practices emergency medicine at NewYork-Presbyterian/Weill Cornell Medical Center and NewYork-Presbyterian/Lower Manhattan Hospital. She also practices as a sports medicine physician within the Weill Cornell Emergency Orthopedic Sports Medicine Clinic, where she sees patients with non-operative musculoskeletal complaints. Dr. Justine Ko is board certified in both emergency medicine and sports medicine.