Yoshihiro Togashi
Yoshihiro Togashi is the creator of Level E, Yu Yu Hakusho, and Hunter X Hunter. Married to Naoko Takeuchi, with whom he has recently[when?] had his second child. Has recently[when?] been taking several long hiatuses for undisclosed reasons, but poor health, Creator Breakdown mixed with editor attempts at Executive Meddling and/or a focus on home life are the most frequent guesses. His art has also become very crude and Off-Model, usually corrected by the time it releases into a compiled Tankoubon.
Strangely, Togashi is the highest-paid mangaka in Jump's payroll, and has the ability to take the hiatuses which he's famous for without consequence. This has been referred to as "Togashi-ism", and the only other person employed by Shueisha who has such favorable contract conditions is Kyosuke Usuta, author of Pyu to Fuku! Jaguar.
The other thing Togashi is famous for is his gratuitous amounts of Ho Yay in his work - and not because he sells more manga that way; GLBT topics are one of his personal interests.
The artist he is most inspired by is H. R. Giger, which should tell you something about his own predilections.