He has doctorate degrees in Mathematics, Chemistry, and Engineering as well as Bachelor's Degrees in Psychology and Sociology. His strengths lay in geographic profiling, cryptology and discerning patterns. Has an IQ of 187, an eidetic memory(like a photographic memory) and can read 20,000 words per minute. Also has a sleight of hand and magic tricks.
Sheldon is just a theoretical physicist compared to Reid, that just so happens to also be a genius with the same IQ but he only has 2 PhD's. Reid on the other hand has PhD's in chemistry, Engineering, and Mathematics, and he holds BA's in Psychology and Sociology and is working on a BA in Philosophy ; IQ of 187 as well as an eidetic memory.