Artist.
Judging from his old tweet, this artist tag on danbooru may mistakenly contain another artist's works.

Nickname: "Hēsuke" or へすけ (Hesuke)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=1964415
• Twitter account: http://twitter.com/hesuke_74
• Twitpic account: http://twitpic.com/photos/hesuke_74