Rob Letterman is an American film director, writer, and voice actor.

Before Letterman's filmic subjects took him into outer space with Monsters vs. Aliens (2009), he was taken underwater, having directed and written DreamWorks Animation's 2004 Academy Award-nominated hit comedy Shark Tale, starring Will Smith, Renée Zellweger, Angelina Jolie and Jack Black. His writing efforts on the film also netted him an Annie nomination.

Prior to Letterman's joining DreamWorks Animation, he directed the short film Los Gringos, which was accepted at 2000's Sundance Film Festival.

In 2010 Letterman directed the live-action film Gulliver's Travels, starring Jack Black in the lead role.

Letterman was born in Hawaii. Attended Mid-Pacific Institute, USC.

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