David Hamann, M.A., born 1981, is a PhD student at the Free University Berlin. He is writing his dissertation about Paul Nathan and the work of the Hilfsverein der deutschen Juden.
http://www.geschkult.fu-berlin.de/e/fmi/arbeitsbereiche/puschner/puschner_uwe/paul_ina/Doktorand_inn_en/David_Hamann.html