Major Edwin Howard Armstrong, 1890 to 1954.  Maj. Armstrong was an RCA member and President (1916-1920).  There is probably no other RCA member who contributed more technology to the wireless industry than Maj. Armstrong.  

Armstrong was deeply involved in the effort of amateurs to span the Atlantic Ocean during the Transatlantic Tests from Greenwich Connecticut to Scotland in December 1921.  During his career, Armstrong created five major technologies, three of which are still in wide use today (bolded):  the regenerative receiver (1913), the superhetrodyne receiver (1918), the superregenerative receiver (1920), frequency modulation (FM-1930s), and multiplexing of multiple FM signals (1934-1952, together with John Bose). 

Maj. Armstrong was educated at Columbia University in New York City, receiving his electrical engineering degree in 1913, and a Doctor of Science degree in 1929.  He served during World War I as a captain and major in the U.S. Army Signal Corps.   He worked under Columbia Professor Michael I. Pupin, and became a professor of electrical engineering at Columbia starting in 1934.  During World War II he donated his various patents, including those on FM, to the government at no cost.  Unfortunately, after the war large corporations refused to honor his FM patents, and Armstrong was forced to engage in a long and costly set of lawsuits, all of which were eventually won, but at the cost of his own life. 

He received his namesake medal (the Armstrong Medal) in 1950.  His 425 ft. 3-armed tower on the Palisades in Alpine New Jersey can still be seen today.  Originally used in 1938 for his FM experiments in the 1930s, it was used by local TV stations after the collapse of the World Trade Center towers in 2001. 

For more information on Major Armstrong you may wish to purchase the 321 page RCA book "The Legacies of Edwin Howard Armstrong".