So famous you had to say it twice!

I looked him up...
https://en.wikipedia.org/wiki/Grant_Imahara

Another case of being familiar with his work without knowing it was him.

 Quote:
After graduation, Imahara was hired as an engineer for Lucasfilm's THX division; he then moved to the company's visual effects division, Industrial Light & Magic (ILM), where he worked for nine years. While at ILM, he was involved in several films, including The Lost World: Jurassic Park, Star Wars: Episode I – The Phantom Menace, Galaxy Quest, AI: Artificial Intelligence, Star Wars: Episode II – Attack of the Clones, Terminator 3: Rise of the Machines, The Matrix Reloaded, The Matrix Revolutions, Van Helsing, and Star Wars: Episode III – Revenge of the Sith.[6]

Imahara is credited in many feature films as a model maker. In particular, he is credited for his work in updating the aging R2-D2 robots for the Star Wars prequel trilogy.[7] As an official Artoo Technician, he makes a cameo appearance in the mockumentary R2-D2: Beneath the Dome.[8]