Mr. Justman, who moved to Los Angeles in 1980, was additionally a fixture behind the scenes with the J. Geils Band because it was climbing from the golf equipment of Boston towards fame. In the mid-Seventies, he made a brief documentary, “Postcards,” concerning the high-energy blues-rock band’s frenzied life on the street. That movie, which featured appearances by the rock critic Lester Bangs, was broadcast on PBS.

In addition to his brother, Mr. Justman is survived by his spouse, Saundra Jordan, and his sister, Peggy Suttle Kligerman.

Not all Mr. Justman’s work with the J. Geils Band was behind the digicam. He typically collaborated on songs along with his brother, and he contributed lyrics for all of the songs on the band’s remaining studio album, “You’re Gettin’ Even While I’m Gettin’ Odd” (1984), recorded after the kinetic frontman, Peter Wolf, left the band. (Seth Justman dealt with many of the lead vocals.)

But, his brother stated, it was Mr. Justman’s ever-present movies, not his phrases, that helped break the band into the pop stratosphere. His “Freeze Frame” video, that includes band members wearing white and splattering each other in paint as in the event that they have been human Jackson Pollock canvases, obtained heavy airplay on MTV. The tune hit No. 4 on the Billboard singles chart in 1982.

But it couldn’t match “Centerfold,” from the earlier 12 months, in ubiquity. The video for that tune, that includes fashions marching round a highschool classroom in teddies and, famously, a snare drum stuffed with milk, change into a token of Generation X popular culture, and the tune turned the band’s first and solely No. 1 hit.