[1] Stone founded Filmsonix in 1987, sold the Record Plant in 1989, and was the founder and CEO of World Studio Group.

The MPGA developed into the Producers & Engineers Wing of the National Academy of Recording Arts and Sciences (NARAS).

[7] In early 1968 Kellgren and Stone opened a new studio at 321 West 44th Street, creating a living-room-type of environment for the musicians.

Seeing the early success of the New York studio, Kellgren and Stone decided to move to the West Coast and open another one in Los Angeles.

He said sometimes musicians would "come and live at the Record Plant for a while" because they could sleep, eat, drink, party and play music.

"[11] If the musicians' antics wrecked any part of the studio—which "was a given" for Moon, according to Stone—they were not scolded or turned out; Stone said he simply charged the recording project an inflated fee for repairs.

[9] As well, the duo widened their scope with more remote recording dates in 1973 including performances by Alice Cooper, Vikki Carr, Sly Stone, Todd Rundgren, Joe Walsh and Rod Stewart.

Guitarist Ronnie Wood wrote that Kellgren was probably electrocuted while trying to fix some underwater speakers in his pool,[13] but the cause of death remains uncertain.

[15] Soundtracks that the Record Plant tracked and mixed there include ones forFlashdance, Star Trek II: The Wrath of Khan, Annie, 48 Hrs., and An Officer and a Gentleman.

By 1986, Jim Pace and Jeff Evans purchased the company from Stone and operated out of the Record Plant facilities unit 1992, continuing currently in West Hollywood.

World Studio Group was chosen by Larry Hamby of A&M Records who proposed Stone's involvement with Woodstock '94.

[18] Stone arranged for four remote recording trucks, two for each stage, at Woodstock '94, as a safety backup in case something went wrong.

Bob Clearmountain was chosen as chief audio engineer to tie the four parts together, and to mix the resulting album.

After Peter Gabriel's concluding set ended in the wee hours of Monday, August 15, 1994, Stone's plan was carried out: all of the performances were digitally copied and backed up in the next two days.

[20] In January 2016, Stone and Kellgren were inducted into the TEC Awards Hall of Fame at the NAMM Show, honoring their co-founding of the Record Plant.