Sugerman died Wednesday, RollingStone.com reported Friday.
At age 14 he began answering the Doors' fan mail and was later promoted to management associate and then manger.
Later, he worked as technical advisor on Oliver Stone's 1991 film, "The Doors," which portrayed the group's hedonistic lifestyle.
In 1980 he co-wrote the Doors biography, "No One Here Gets Out Alive," with music journalist Jerry Hopkins.
After Morrison died in 1971, Sugerman managed Doors guitarist Robby Krieger, keyboard player Ray Manzarek and drummer John Densmore.
"He was a fine, good and decent man," Manzarek told Rolling Stone. "Smart as a whip with a very high IQ. I've known him since he was 14-years-old, and he gradually developed into one of the new breed of Jewish-American Buddhists. His heart was in the heavens and he is now in the light with the Buddha and Jim Morrison."
Sugerman is survived by his wife, Fawn (formerly Fawn Hall), his brother, Joseph, and his sister, Nan.