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Joseph Leonhardt 1900 - 1964

Joseph Leonhardt of Michigan was born on September 23, 1900, and died at age 63 years old in April 1964.

Joseph Leonhardt
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Michigan
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September 23, 1900
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April 1964
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Male
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Updated: November 3, 2011
Biography ID: 53400538 What's this
Joseph Leonhardt Joseph Leonhardt (1900 - 1964)
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Joseph Leonhardt's History: 1900 - 1964

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  • 09/23
    1900

    Birthday

    September 23, 1900
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    Unknown
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  • 04/dd
    1964

    Death

    April 1964
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  • Did you know?
    Joseph Leonhardt lived 12 years shorter than the average family member when died at the age of 63.
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In 1900, in the year that Joseph Leonhardt was born, the German physicist Max Planck formulated an energy theory, postulating the existence of "quanta," which lays the groundwork for the quantum theory of modern physics. In December, he introduced a paper on the Planck postulate which stated that E=hv - the energy of a photon is proportional to its frequency times a constant. Planck won a Nobel Prize in 1918 for his work in theoretical Physics.
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In 1920, he was 20 years old when on November 2, radio station KDKA began broadcasting in Pittsburgh, PA. This was the first commercial radio broadcast in the United States. Westinghouse, a leading manufacturer of radios and the backer of the station, chose the date because of the Presidential election. People liked it because they could hear about the results of the election between Harding and Cox before the morning papers arrived. Four years later, there were 600 commercial stations broadcasting in the U.S.
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Joseph Leonhardt's Family Tree & Friends

Joseph Leonhardt's Family Tree

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Joseph Leonhardt Sep 23, 1900 - Apr 1964
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Other Biographies

Other Joseph Leonhardt Biographies

Leonhardt, Joseph (Feb 25, 1930 - Oct 7, 2011) Leonhardt, Joseph (Apr 20, 1893 - Mar 1978) Leonhardt, Joseph (Jul 5, 1915 - Mar 6, 1994) Leonhardt, Joseph (Feb 24, 1920 - Jan 23, 2004)
Leonhardt, Joseph (Jan 6, 1918 - Apr 27, 1995) Leonhardt, Joseph (Feb 24, 1908 - Jun 1978) Leonhardt, Joseph (Apr 1, 1898 - May 15, 1973) Leonhardt, Joseph (Jun 19, 1891 - Aug 1976)

Other Leonhardt Family Biographies

Leonhardt, Luda (Feb 17, 1902 - Mar 1986) Leonhardt, John (Jul 20, 1902 - Aug 1969) Leonhardt, Marion (May 5, 1901 - Nov 11, 1998) Leonhardt, Walter (Sep 20, 1900 - Jun 1981) Leonhardt, George (Sep 11, 1916 - Apr 23, 2003) Leonhardt, Mary (Sep 27, 1926 - Mar 2, 2009) Leonhardt, Frank (Jul 14, 1907 - Jan 1973) Leonhardt, Horst (Dec 15, 1920 - Aug 18, 2007) Leonhardt, Anneliese (Jun 2, 1926 - Feb 1983) Leonhardt, Edna (Mar 25, 1907 - Mar 1972)
Leonhardt, Charlotte (Aug 22, 1943 - Feb 27, 1996) Leonhardt, Kurt (Sep 29, 1918 - Oct 1970) Leonhardt, Marie (Apr 12, 1891 - Mar 1977) Leonhardt, Margaret (May 5, 1896 - Feb 1976) Leonhardt, Leland (Sep 12, 1921 - Sep 21, 1994) Leonhardt, Oscar (Dec 18, 1895 - Apr 30, 1990) Leonhardt, Susan (May 30, 1894 - Jul 1968) Leonhardt, Margaret (May 21, 1924 - Apr 1, 2009) Leonhardt, Louise (Jun 13, 1902 - Feb 15, 1993) Leonhardt, Charles (Nov 7, 1923 - Jun 15, 2004)
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