[Darkman.exe213]

Originally Posted by Kagura89

http://www.star-driver.net/character/katashiro.html
According to the official website, his name is Ryousuke Katashiro, an acquaintance with Head as seen in episode 1. He also the chairman of Glittering Crux Brigade meeting and he's the one that take George's Star Driver badge after he got owned by Takuto at the end. He look similar to Shirow Watari from RahXephon.

Not just similar, completely identical, except the beard shape and clothing.

Speaking of Rahxephon...

Spoiler for Rahxephon:

Shirow Watari turns out to be Ayato's(the main character) father. Could the identical appearances between the Ryousuke Katashiro and Shirow Watari be a possible hint? His name even starts with an R, so he might have been the artist of that painting. Furthermore, we already know that the painting itself is a homage to Rahxephon.