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Alexander Mack was a German clergyman and the leader and first minister of the Schwarzenau Brethren in the Schwarzenau, Wittgenstein, community of modern-day Bad Berleburg, North Rhine-Westphalia, Germany. Mack founded the Brethren along with seven other Radical Pietists in Schwarzenau in 1708. Mack and the rest of the early Brethren emigrated to the United States in the mid-18th century, where he continued to minister to the Brethren community until his death.