Arnold was an American dermatologist.
In the infancy of the AIDS epidemic, Klein became one of the first doctors in Los Angeles to diagnose a case of Kaposi’s sarcoma in young patients.
Arnold was born on February 27, 1945, in Mt. Clemens, Michigan, the son of a Jewish Orthodox rabbi.
He was raised in Michigan and North Miami, Florida, graduating from North Miami High School in 1963.
In 1967, Klein earned his Bachelor’s degree in Biology from the University of Pennsylvania.
Arnold attended the University of Pennsylvania School of Medicine, earning his Doctor of Medicine degree in 1971.
He completed an internship at Cedars-Sinai Medical Center in Los Angeles and his residency in dermatology at the University of Pennsylvania and the University of California at Los Angeles (UCLA).
In 1975, Arnold served as Chief Resident in Dermatology at UCLA.
Arnold died at age 70 in October 2015.