1890 - Born on December eighteenth in New York City.
 

1912 - Invented regenerative circuit, making long distance radio communications feasible.
 

1917 - Invented superheterodyne circuit, which permitted unprecedented selectivity and amplification in processing radio signals.
 

1919 - Recognized by the Radio Club of America as the foremost figure in radio.
 

1922 - Invented superregenerative circuit, which made two-way mobile radio possible.
 

1923 - Designed and built portable superheterodyne AM receiver to be a wedding present for his bride, Marion MacInnis.
 

1933 - Invented wide band FM technology, which surpassed AM by:
 

• reducing static to an insignificant factor;

• eliminating interference by same-frequency stations;

• facilitating use of entire audio frequency spectrum;

• permitting complete dynamic range reproduction;

• receiving all stations at the same volume level;

• penetrating steel bridges, underpasses and other structures not previously reached by radio signals;

• providing reliable night and day coverage within a predetermined area;

• greatly increasing non-fading reception range.
   

1941 - Assigned all patents, without fees or royalties, to U.S. Government for military use during World War II.
 

1952 - Developed, with John Bose, FM multiplex transmitting which made radio and television stereo broadcasting possible.
 

1954 - Died on February 1 in New York City.