Isaac Maarsen took his bachelor's degree in classical literature and obtained credentials as a moreh at age 22. He taught at the Nederlandsch-Israëlitisch Seminarium in Amsterdam. In 1919 he became a rabbi in Amsterdam, and in 1925 he was appointed chief rabbi in The Hague. He continued to serve in this position until his deportation. He vehemently opposed mixed marriages and the reform movement w…