Alan Blumlein Alan Dower Blumlein (29 June 1903 – 7 June 1942) was an English electronics engineer, notable for his many inventions in telecommunications, sound recording, stereo, television and radar. He received 128 patents and was considered as one of the most significant engineers and inventors of his time. Nathaniel Baldwin Nathaniel Baldwin (December 1, 1878 – January 19, 1961) was the inventor of headphones and a supporter of the early Mormon fundamentalist movement. Oskar Heil Oskar Heil (1908, in Langwieden/Rhineland-Palatinate – 1994) was a German electrical engineer and inventor. He studied physics, chemistry, mathematics, and music at the Georg-August University of Göttingen and was awarded his PhD in 1933, for his work on molecular spectroscopy.