Aliasing irodori_shachou -> aya_shachou.
Reason: His pixiv profile, including URL, and the URL for his Twitter page, use "ayasyatyou" (or, to romanize along Danbooru standards, "aya shachou"). Additionally, his Skype name is listed on his pixiv profile as "president-aya" (in English).
Based on this, I've concluded that "irodori" was an incorrect reading of the 彩 in 彩社長, when "aya" would have been the correct one.
Updated by a moderator