I'm pretty sure it's Takehiko Fujii. Dear, Mr Sota would be the correct one if you were to label it with Sota Fujimori, but as for this one this album is a tribute to SLAKE so Takehiko is correct.
http://en.wikipedia.org/wiki/Takehiko_Fujii
EDIT: Speaking of Dear, Mr Sota I'll have to add that to the site.