[1][2] He has managed numerous musical artists, including UB40, Glen Campbell, Dave Stewart of the Eurythmics, Brian Setzer,[3] Sublime,[4] and Butthole Surfers.

[2] Kaplan's producing credits include albums for Dave Stewart,[2] Glen Campbell, Brian Setzer, Stray Cats, Dan Hicks, SuperHeavy, and Gary Hoey.

[6] In 2012, Kaplan became co-manager of country singer Glen Campbell, who had just been diagnosed with Alzheimer's disease, and was the executive producer of his final album Ghost on the Canvas.

[6] In 2013, Kaplan signed Eric Clapton to Surfdog Records and distributed his new album, Old Sock, in North America.

[12] Kaplan served on the board of directors for an environmental non-profit called the Surfrider Foundation.