Among the bands Diltz played with were the Modern Folk Quartet (later Quintet). While a member of the Modern Folk Quartet, Diltz became interested in photography, met The Monkees, played on some of their recording sessions, and took numerous photographs of the band, many of which have been published. His work also attracted the eye of other musicians who needed publicity and album cover photos. He was the official photographer at Woodstock, and the Monterey and Miami Music Festivals, and has photographed over 80 record album covers.
Diltz photographed 1960s folk-rock stars who lived in Los Angeles's Laurel Canyon. During that time, Laurel Canyon was a center of American music. Many rising stars were drawn to Laurel Canyon, a laid back neighborhood in the Hollywood Hills. "There was a sense of brotherhood in all of this - in the music scene, in Laurel Canyon, certainly at Woodstock. But all the people I photographed: I love their music." 
In 1971 he and songwriter Jimmy Webb nearly died in a glider aircraft accident. Webb was piloting and Diltz was taking motion picture film from the rear seat. Both suffered significant injuries. The film did not survive.
Diltz contributed all the photographs to the 1978 book, California Rock, California Sound, which archived the Los Angeles music scene of the 1970s. British writer, Anthony Fawcett, provided the bulk of the text.
Diltz is co-founder of the "Morrison Hotel" Galleries along with Peter Blachley and Rich Horowitz in SoHo, New York City and in West Hollywood. The galleries specialize in fine-art music photography, including his own works.
Diltz is still active, including a role as contributing photographer to The Henry Rollins Show. He was among the 43 photographers invited to donate a print to "FOCUS: an auction of the finest photography to benefit City Harvest...." The fund-raiser was on September 18, 2008 supported City Harvest, a food collection bank in New York City.
Diltz lives in California. The archive in his bungalow in North Hollywood, California holds some 400,000 photographs, alphabetized from "A" (for America) to "Z" (for Zappa).
- O'Hagan, Sean (May 25, 2013). "Henry Diltz:caught in the Canyon". theguardian. Retrieved May 25, 2013.
- Mason, Anthony. "Capturing an era of rock nobility on film". CBS Interactive Inc. CBS News. Retrieved February 8, 2015.
- Lachno, James (April 7, 2014). "Henry Diltz Q & A: the story of Laurel Canyon and LA folk". The Telegraph. Retrieved 10 July 2015.
- Diltz's photography
- CALIFORNIA DREAMING: Memories & Visions of LA 1966-1975 The Photographs of Henry Diltz
- Henry Diltz at the Internet Movie Database
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