Max Paul Eugen Bekker (1882-1937): A German music critic and author. He was known for his brilliant writing style and deep understanding of music theory and practice. Bekker served as the chief music critic for major publications like the Frankfurter Zeitung and the New Yorker Staats-Zeitung. Wikipedia: Paul Bekker
Prof. dr. P.A. (Paul) Bekker: This Paul Bekker appears to be an academic specializing in finance or economics. Information suggests he is a professor at the University of Groningen and his research interests lie in areas like yield curve modeling and arbitrage-free modeling. You can find his academic profile on the University website. Rijksuniversiteit Groningen: Curriculum Vitae van prof. dr. P.A. (Paul) Bekker