Robert John MacArthur is an orthopedic surgeon born in Albany, New York. He received his medical degree from Columbia Medical School in 1991 after obtaining his undergraduate degree from UC Berkley. He completed his internship and residency at Harbor Hospital and UCLA, where he served as Chief Resident from 1992-1996. Since then, he has held positions as an instructor, salaried surgeon, and in private practice. He is board certified in orthopedic surgery and has affiliations with several hospitals. His practice focuses on general orthopedics excluding some specialized areas.