Mandelman became more engaged in music during his teen years and was highly influenced by The Beatles.

In 1975, Mandelman formed the band Hakol Over Habibi alongside Shlomit Aharon, Kiki Rothstein and Yuval Dor, which was active until 2002.

He also dubbed some characters in Ninja Turtles: The Next Mutation until 2003 when these roles were passed on to Efron Etkin in the follow-up series.

Other roles include dubbing Goofy since 1989 and some of the major Looney Tunes characters since Space Jam.

As an actor, Mandelman has appeared in television shows such as Shemesh and A Wonderful Country.