Mark Giambruno
Mark Giambruno (born 1957, in Placerville, California, died 2023) was an American 3D artist, art director, writer, and voice actor. Giambruno was an early employee of Mondo Media, and as such, work on some of their earlier projects, he was also well known for being the voice of Lifty and Shifty, on the adult-animated web series Happy Tree Friends, before Kenn Navarro would take over the role of both of them after Giambruno left. According to Warren Graff on his TikTok, Giambruno died long ago, from an unknown cause.
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