Philipp de Haas was a German rabbi who, among other things, held the office of Oldenburg State Rabbi from 1929 to 1935. De Haas was a strong advocate for his community, for example, reducing his own salary due to the financial hardship caused by the National Socialist government. He married Anny, née Markhof, a native of Dortmund, with whom he raised a family of three children. His daughter Miriam de Haas later married Leo Trepp, the successor to her father's post.

Dr. phil. Nathan Marcus Adler was a German-British rabbi and chief rabbi. He performed his duties both in the German cities of Oldenburg and Hanover and in London. In the process, he served as the regional rabbi in the Duchy of Oldenburg until 1830, after which he replaced his father (Chief Rabbi of the British Empire) in Hanover and became Chief Rabbi of the United Hebrew Congregations of the British Empire in 1845. Adler was significant as a representative of a mediating position between rigid Orthodoxy and extreme Enlightenment.