Rabbi Eliezer Yehuda Waldenberg (December 10 1915 -November 21 2006) was known as the Tzitz Eliezer after his monumental halachic treatise "Tzitz Eliezer" that covers a wide breadth of halacha, including medical halacha, as well as more common halachic issues from Shabbat to kashrut. He was born in Jerusalem in 1915 and died there on November 21, 2006. Wikipedia
This article focuses on the responsa of Rabbi Eliezer Yehuda Waldenberg, author of the Tzitz Eliezer, which are relevant to the status of transexuals. suelong.tripod.com/tzitz.html
The definitive Wikipedia entry for Eliezer Waldenberg. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Eliezer_Waldenberg
Rabbi Waldenberg, the rabbi of the Shaare Zedek Medical Center in Jerusalem, specialized in medical questions. www.israelnationalnews.com/news.php3?id=115965