From 1957 to 1958, he worked as a Rotating Intern at the Case Western Reserve's Metropolitan General Hospital in Cleveland, Ohio.

From 1959 to 1961, he served at the rank of lieutenant in the U.S. Navy as the medical officer aboard the USS Forrestal in the Sixth Fleet.

From 1965 to 1966, he was a spine fellow at the Los Angeles General Hospital, where he was also an instructor in Orthopedic Surgery at the University of Southern California.

During his career, Levine published over 65 peer reviewed articles, 16 books and chapters and gave more than 300 invited presentations.

He was the proposer of the Scoliosis Research Society in 1964, a founding member and its president from 1978 to 1979, serving on the board of directors for fifteen years.

[4] In 1995, Levine retired from active patient care and the next year moved to Florence, Italy with his wife Janet, an artist, where he lectured at Careggi University Orthopaedic Hospital, studied antique furniture restoration and perfected his Italian cooking.