AVROHOM BEN AVROHOM is the biography of Graf Valentin Pototcki, a European nobleman who converted to Judaism in the early 1700s.
Asher Wade, a former Methodist minister, converted to Orthodox Judaism in May 1983.
His web site is: www.AsherWade.com.
NOTE: This list of converts to Orthodox Judaism is very far from complete, and some of the books mentioned above have been out-if-print for decades. Sorry about that.