Dr. Zamfirov, also known as Dr. Zed, was born and raised in Bulgaria. He played soccer professionally and he was selected to play for the Bulgarian Junior National Team. Early in his sports career he decided to become a physician for athletes and to treat their sports injuries. He received his MD degree from the Plovdiv Medical University in 1987. He then completed his Orthopedic Surgery Residency and specialized in sports trauma and knee surgery.