Weisz is a prolific voice actor in the anime community, having done voices in various anime shows such as Outlaw Star, The Big O, Rave Master, and Scryed. He is also well known for his past voice work in Saban live-action shows.
Some of his better known-roles there included Mantix in Beetleborgs Metallix, as well as Falkar in Power Rangers: Lightspeed Rescue, and also the male voice of the Org General named Mandilok in Power Rangers: Wild Force.
He co-directed the automated dialogue replacement for Bobobo-bo Bo-bobo alongside another voice actor, Michael Sorich. He is also a live-audience coach for Disney Channel shows, helping the teen and child stars with improvisation on set.