There are two biologists, one physicist, one neuroscientist, and one medical scientist. The list is dominated by individuals with careers in politics, religion, literature, philosophy, and history.
I agree, a list of the Top 100 Intellectuals would be dominated by mathematicians, scientists, engineers, and probably a hacker or to, but this list is titled The Top 100 PUBLIC Intellectuals, i.e. public policy, so I wasn't expecting any different.