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Edward Teller was a Hungarian-born American theoretical physicist, known colloquially as "the father of the hydrogen bomb," even though he claimed that he did not care for the title. Teller is best known for his work on the American nuclear program, specifically as a member of the Manhattan Project during World War II, his role in the development of the hydrogen bomb, and his long association with Lawrence Livermore National Laboratory. He achieved infamy in the 1950s due to his controversial testimony in the security clearance hearing of his former Los Alamos colleague J. Robert Oppenheimer, and as such became ostracized from much of the scientific community. He continued to find support from the U.S. government and military research establishment, particularly for his advocacy for nuclear energy development, a strong nuclear arsenal, and a vigorous nuclear testing program. In his later years he became especially known for his advocacy of controversial technological solutions to both military and civilian problems, including a plan to excavate an artificial harbor in Alaska using thermonuclear explosives. He was a vigorous advocate of Ronald Reagan's Strategic Defense Initiative, perhaps overselling the feasibility of the program.