Education
In 1911 he graduated from Johns Hopkins University, and later he used his degree to serve in World War I.
In 1911 he graduated from Johns Hopkins University, and later he used his degree to serve in World War I.
Greensfelder was an inventor with numerous approved patents, including one for "Method and Apparatus Foreign Synchronously Producing Sounds To Accompany Motion Pictures". This patent was a system that would make sound automatically play while a motion picture was playing. Other patents include "Changeable Profile Toy" and "Loose Leaf Binder".