Tilman Hausherr is a German citizen living in Berlin, Germany. He is a software developer and the author of the software Xenu's Link Sleuth, but he is best known for his vocal criticism of Scientology in his spare time. He has been described a "critic of Scientology"*, an "anti cult-figure"*, and an "anti-cultist" * by various sociologists of religion. Hausherr maintains an extensive website with material related to Scientology, including the Scientology celebrities FAQ.

Hausherr appears on the Scientology-sponsored website Religious Freedom Watch, which features depictions of "anti-religious extremists," virtually all of whom are strongly critical of Scientology.Tilman Hausherr at religiousfreedomwatch.org Various sources credit Hausherr for coining the term "Sporgery" in the Usenet newsgroup alt.religion.scientologyWho is the "real" Clark on ARS?The Sporgeries FAQ

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