yamamura hiroki
This artist is a professional animator who worked closely with studio Shaft on series such as Sayonara Zetsubou Sensei, Mahou Shoujo Madoka Magica, and the Monogatari series mostly as chief animation director.
Prior to that (under the pen-name "Murayama Takahiro") he was the illustrator of ero-games such as Usaneko and GHQ: Chihiro Gakuen Ura Gakuensai from about 2003 - 2007.
Before that, he was a doujin artist with the same pen-name styling himself as "Studio Pakli" and published a few doujinshi with Suzuki Amaharu in the "Jibaku System" circle and others from about 1999-2003.