就读日本多摩美术大学美术部艺术学科，専攻影像制作。毕业后进入GAINAX。首次工作就遇上掀起社会现象的《新世纪福音战士》，负责原画和动画的部分。此后在《他和她的事情》及《FLCL》担任多集作画监督及分镜工作。于《DEAD LEAVES》首次成为监督。

风格颇受动画师金田伊功影响，常应用到行内俗称“金田透视法”于作画中。当中以《他和她的事情》第19话的制作和游戏“武蔵伝II”的片头动画最能突显相关能力。

2007年，其监督的《天元突破 红莲螺岩》以崭新的表达手法，构思和包装故事，令其在第12回动画神户赏中得到“个人赏”，亦带领其他制作成员于多个动画展览和颁奖典礼中得到提名及奖项。同人组织“墨水瓶”的主办人，笔名为际志宇舞。[1]

2011年，带同《天元突破 红莲螺岩》的班底离开GAINAX。[2]2011年8月22日与大冢雅彦成立新动画公司TRIGGER。

喜欢电影，特别是早期吴宇森、Robert Rodriguez和Stephen Sommers导演的作品。

Hiroyuki Imaishi (今石 洋之, born October 4, 1971) is a Japanese key animator and anime/anime influenced animation director and one of the co-founders of Trigger. His style is marked by fast and frantic animation combined with elaborate storyboarding and punchy direction. Prior to founding Trigger, he was an animator and director at Gainax.

His series director debut was Tengen Toppa Gurren Lagann (2007). The anime received an Excellence Prize at the 2007 Japan Media Arts Festival, and Imaishi himself received an individual award at the twelfth Animation Kobe Festival. In 2008, the anime received both "best television production" and "best character design" from the Tokyo International Anime Fair. Later he went on to work as director in the 2010 anime series, Panty & Stocking with Garterbelt. His main influence of being an animator and director are Yoshinori Kanada and his works, in which all his anime titles such as Dead Leaves, Gurren Lagann and Panty & Stocking with Garterbelt pay special tributes to him and his art.

In 2011, Imaishi branched off Gainax to form a new studio, Trigger, alongside Masahiko Ohtsuka and others. His first directorial work at the studio is Kill la Kill.

Source: Wikipedia