I'm fairly certain Bill Gates is an INTP.
I also have my suspicions about Conan.
It's hard to say for sure, but I tend to agree with this video.Bill Gates strikes me as ENTJ. Don't get INTP seeing as he is more interested with roll-out & strategy than with structure. His behavior in the college days of only giving a shit about things related to his work sounds like a Te-dom.
Jim Parsons.
Kind of silly but how about Dexter, from the cartoon "Dexter's Laboratory"? If you've ever seen it, do you think he was an INTP? Lol..or maybe INTJ?