Emile Berliner (1851-1929) was an inventor best known today for his innovative helicopter designs. He began experimentation with rocket propulsion as early as 1903 and began exploring the possibilities of vertical flight shortly thereafter. After his service in World War I, Emile's son Henry Adler Berliner (1895-?) joined his father in his helicopter experiments. During the early nineteen-twenties, the Berliners produced several helicopter designs. Henry Berliner later became involved in the development of fixed-wing aircraft and in 1929 joined with Temple-Joyce to form Berliner-Joyce.