Answer
In addition to Jamie Hyneman and Adam Savage, the Build Team on MythBusters included Grant Imahara, Kari Byron, and Tory Belleci. Each member of the Build Team had their own area of expertise, with Imahara specializing in robotics, Byron in prop making and special effects, and Belleci in pyrotechnics. The Build Team worked together to design and build the experiments that were tested on the show.