Zack is an adult voice on GoAnimate. However, on GoAnimate, he is a David clone besides Evil Genius. But on VoiceForge, he and Evil Genius are their own separate voices.
He is also the voice of Zack in the grounded series titled Zack's Grounded Series by Don Angelo Productions123
On March 26, 2013. Zack and all other VoiceForge voices has been removed from GoAnimate and GoAnimate For Schools.