Antijen is run by Aunty - who hosts many lists relating to transitioning for both families and the person in transition. It's a great resource with very nice, understanding people behind it.
Dr. Benjamin was one of the first physicians to work with gender dysphoric persons. A http://www2.hu-berlin.de/sexology/GESUND/ARCHIV/COLLBEN.HTM" target="blank">brief biography of Dr. Benjamin is available at the http://www2.hu-berlin.de/sexology/" target="blank">Magnus Hirschfeld Archiv fur Sexualwissenschaft website.