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English: Hugo Münsterberg (June 1, 1863 – December 19, 1916) was a German-American psychologist, and Harvard professor. He was one of the pioneers in applied psychology, extending his research and theories to Industrial/Organizational (I/O), legal, medical, clinical, film making, educational and business settings. Münsterberg encountered immense turmoil with the outbreak of the First World War. Torn between his loyalty to America and his homeland, he often defended Germany's actions, attracting highly contrasting reactions.