He worked as a member of "The Wrecking Crew", with Hal Blaine, Joe Osborn, Larry Knechtel and others, on sessions for Phil Spector, and contributed guitar parts to The Beach Boys' album Pet Sounds.

[1][5] In the 1960s and later years he also worked on records by the Monkees, the Association, Scott McKenzie, Johnny Rivers, the Fifth Dimension, Rick Nelson, Randy Newman, Spanky & Our Gang, Tommy Roe, Fats Domino, The Byrds, Michael Jackson, Helen Reddy, Frank Zappa, and others.

[7] Under the pseudonym Lybuk Hyd, Deasy also played guitar and sitar on the psychedelic concept album Tanyet, credited to The Ceyleib People, which also featured Ry Cooder.

[5] Deasy continued to record with leading musicians, including Frank Sinatra, Ella Fitzgerald, Barbra Streisand, Chet Baker, and Mel Tormé.

[3] The Deasys also co-pastored Rock Church Southeast in Port Arthur, Texas, until it eventually shut its doors when Hurricane Harvey flooded the building.