This author ID (ryanmichaela) is amibiguous and can stand for anybody named either "Ryan, Michael A." or "Ryan, Michaela".
1) From Amazon: "Michaela Ryan is a freelance writer and journalist who has contributed to various women's and health publications. [She] grew up in Melbourne, has lived in Japan for a year and speaks Japanese and French."
2) Ryan, Michael A., A Kingdom of Stargazers; asst. prof. of late medieval history, Purdue; b. July 16, 1973; fullname Michael Alan Ryan (LC|n 2009006771)