I want to know too.. ( ° ʖ °)♡ ♡
Chiaki you are stuck with me today because I am resting at home with a cold ... lol
Shoujo male authors:
1) Shinji Wada (author of the famous Pygmalio manga) - died in 2011
http://www.mangago.zone/r/l_search/?name=Shinji+Wada
2) Mineo Maya (this artist is also interested in drawing classic-style BL stories)
http://www.mangago.zone/r/l_search/?name=Mineo+Maya
For josei, I can name Furuya Usamaru (I love his work so much) . However he only did to my knowledge one josei (Donki Kourin), the rest of his work is mostly seinen but he writes romance too.
I am sure I can provide more names but for now this is what I can share.
You can take a look at this. https://www.mangaupdates.com/showtopic.php?tid=42047
Madoka Magica was written by a guy
Thank you all very much.
Male shoujo or josei mangakas?