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National Museum of Nuclear Science & History

Kenneth Greisen was an American physicist. He worked on the Manhattan Project at Los Alamos. He was the leader of Group X-1A (Photogoraphy with Flash X-Rays) until it was dissolved in May 1945. He then became the leader of the Group X-7 (Detonator Developments). His wife, Elizabeth Greisen, accompanied him to Los Alamos during the war.

Greisen’s speciality was the astrophysics of cosmic rays and gamma radiation. After the war, he was a professor of physics and astronomy at Cornell University.

Kenneth Greisen's Timeline
1918 Jan 24th Born in Perth Amboy, NJ.
1938 Received his BS from Franklin & Marshall College.
1942 Received his PhD in physics at Cornell University under Bruno Rossi.
19431946 Worked on the Manhattan Project at Los Alamos.
1945 Jul 16th Witnessed the Trinity Test.
19461976 Worked as professor of physics at Cornell University.
1974 Elected to the National Academy of Sciences.
19751986 Worked as professor of astronomy at Cornell University.
2007 Mar 17th Died in Ithaca, NY.

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