Paul was a "Wirtschaftsberater" (financial advisor) when he lived in Mannheim, Germany, before emigrating to Holland in the 1930s. (Germany, Index of Jews Whose German Nationality was Annulled by Nazi Regime, 1935-1944, ancestry.com)
In addition, Jokos files (numbers 55380, 55379) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.