This is a video of him talking Physics: http://www.youtube.com/watch?v=f2A7BlKbZlM
He appears to understand what he's talking about as well as any typical math/physics teacher. Whether he can come up with his own theories is not something I can tell just from these videos.
http://www.youtube.com/user/mathboysmom#p/u/1/r7-O6ADAW1U