Hartmut Kallmann

The companies IG Farben and AEG provided him a research lab to continue his work with some restrictions.

[4] Thermo Electron corporation (now Thermo Fisher Scientific) credited Kallmann and Broser with pioneering modern day scintillation counting by combining a scintillating material with a photomultiplier, as a means of improving light detection and reducing the eye fatigue apparently common to earlier, cruder methods of detection.

[5] In 1948, Kallmann's knowledge about photomultiplier scintillation counters brought him to the United States as a research fellow for the U.S. Army Signal Corps Laboratory in Belmar, New Jersey.

They would often show up at his large home looking for him, but always came up the front walk, so it was easy for Hartmut and his wife to spot their approach.

Benjamin Bederson, "Fritz Reiche and the Emergency Committee in Aid of Displaced Foreign Scholars", Physics in perspective 7 p.453-472, 2005