An ammunition & bomb researcher.
Although he is an artist, he often collaborates with "Karashi Mentaiko Gochou":http://www.pixiv.net/member.php?id=3182320 on making military&girl-themed doujin books. Their doujinshi, themed on "the bombing of Tokyo":https://en.wikipedia.org/wiki/Bombing_of_Tokyo and "bomb disposal operations,":https://en.wikipedia.org/wiki/Bomb_disposal  are well worth reading.

Japanese name: 山本 権之兵衛 or 山本 權之兵衞 (Yamamoto Gonnohyoue)
The other name: ＡＰＨＥ
Solo circle name & pixiv nickname: たまや (Tamaya)
Joint circle name: 山本部隊試作班 (Yamamoto Butai Shisaku Han) (circle partner: "Karashi Mentaiko Gochou)":http://www.pixiv.net/member.php?id=3182320 

h4.See also

* Pixiv account: http://www.pixiv.net/member.php?id=828156
* Niconico account: http://www.nicovideo.jp/user/5222937
* Niconico MyList: http://www.nicovideo.jp/mylist/23513649
* Niconico Seiga: http://seiga.nicovideo.jp/user/illust/5222937?target=illust_all
* Circle.ms: http://c10085365.circle.ms/oc/CircleProfile.aspx
* The Doujinshi & Manga Lexicon: http://www.doujinshi.org/browse/circle/42098/

yamamoto gonnohyoue