[2] He has produced records for Jimmy Webb, Johnny Mathis, Billy Ray Cyrus, Lamont Dozier and America, and has composed music for Beverly Hills, 90210, Friday the 13th (films and television), Forever Knight, Hard Copy, and many more.

[3][4] Mollin rose to prominence early in his career by co-producing (with Matthew McCauley) Dan Hill's international hit record, "Sometimes When We Touch", in 1977.

[citation needed] In an interview with Spirit of Harmony, Mollin said, "When my parents would tell their friends that I was leaving high school at 16 to make a life as a musician, they would all say 'we're so sorry,' as if I was terminally ill.

These include Willie Nelson, Billy Joel, Carly Simon, Vince Gill, Glen Campbell, Crosby and Nash, Art Garfunkel, Jackson Browne, Linda Ronstadt, Michael McDonald, Amy Holland, David Pack, Sheryl Crow, Natalie Cole, Gregory Porter, Gloria Estefan, Billy Ray Cyrus and Miley Cyrus, and Chris Cornell, among others.

The albums by Jimmy Webb, Ten Easy Pieces, Just Across the River, and Still Within the Sound Of My Voice, have the most number of guest artist duet appearances.

Other notable album examples with numerous duets are Johnny Mathis' Sending You A Little Christmas, Kris Kristofferson's The Austin Sessions, Barry Mann's Soul And Inspiration, Lamont Dozier's Reimagination, and Rita Wilson's AM/FM.

His most well-known TV series include Tri-Star's Forever Knight, Spelling's Beverly Hills, 90210, Paramount's Hard Copy, Columbia Pictures' The New Gidget and USA Network's TekWar.