Hermann Zimmer was an early pioneer of the BaháüàFaith in Germany. Zimmer is one of a few BaháüÃÂs who revived the efforts of Ruth White to oppose Shoghi Effendi, claiming that the Will and Testament of ûAbdu'l-Bahá was forged.
Zimmer was a Baháüàin good standing during World War II, and as a German, traveled to Berlin to unsuccessfully lobby the Nazi government to rescind their ban of the BaháüàFaith. By 1971, however, he wrote a book titled A Fraudulent Testament Devalues the BaháüàReligion into Political Shogism, which criticized the Baháüàadministration.
Zimmer based his claims partly on the work of criminologist Charles Ainsworth Mitchell, who Ruth White had hired to review photocopies of the original Will and Testament of ûAbdu'l-Bahá. Mitchell had compared the photocopies to original samples of ûAbdu'l-Bahá's handwriting. Mitchell's provisional report indicated that the Will was a forgery, pending inspection of the originals. White later placed Mitchell's signed report with the U.S. Library of Congress in 1930. Mitchell could not read Persian, however, and the claims of a forgery were not taken up by many other BaháüÃÂs opposed to Shoghi Effendi at that time, most notably including Ahmad Sohrab.
Hermann Zimmer remained one amongst a small group of BaháüÃÂs to question the authenticity of ûAbdu'l-Bahá's Will. Zimmer attempted to establish a group called "Free BaháüÃÂs" or the "World Union of Universal Religion and Universal Peace" along with Charles Seeburger of Philadelphia, but it is not clear that it actually came into being.
Zimmer's own work was further taken up by Francesco Ficicchia in Der BahÃÂ'ismus-Religion der Zukunft? Geschichte, Lehreund Organisation in kritischer Anfrage, a work which Denis MacEoin notes "did indeed do a lot of damage to the public image of the BaháüÃÂs" in German-speaking Europe and "damaged the BaháüÃÂs and distorted their cause in certain quarters, mainly within the Catholic and Protestant churches." Zimmer and Ficicchia's works were funded and distributed by evangelical Christian organizations in Germany. The work had such a negative impact on the Baháüàcommunity that a lengthy apologetic response came from Schaefer, Towfigh, and Gollmer in Making the Crooked Straight: A Contribution to BaháüàApologetics.