Joeren van Dongen Image source: Jeroen van Dongen Jeroen van Dongen is a Dutch historian of science who edits the Collected Papers of Albert Einstein and wrote Einstein’s Unification. Quotes by Joeren van Dongen in Time OneIn 1921 Einstein presented to the Prussian Academy a paper by Theodor Kaluza … in which the gravitational and electro-magnetic field are geometrically unified in five dimensions. More about Joeren van Dongen Joeren van Dongen website Princeton Review of Einstein’s Unification Paul Dirac J.C. Duffy