Katawa Shoujo Forums

Tony Attwood's english but lives in Australia. You can see a list of his books below:

http://en.wikipedia.org/wiki/Tony_Attwood

They're available in a wide variety of languages and yes, his books are pretty good.

His official page is here: http://www.tonyattwood.com.au/index.php
Looks like a lot of info, and a list of publications on the topic, not only his own.

Ah thanks. I'll look into it.