Kidder was a weapons physicist at
Lawrence Livermore National Laboratory for 35 years, and retired in 1990. He had arrived at the laboratory in 1956. In 1979, Kidder was a witness for the defense in the
United States v. The Progressive case, in which the
U.S. Department of Energy sought to suppress the publication of a magazine article alleged to reveal the "secret of the hydrogen bomb". Kidder favored uncensored publication of the material, which had been compiled from unclassified sources, and claimed that
Nobel Prize-winning physicist
Hans Bethe had been misinformed when Bethe swore an affidavit in favor of censorship. Bethe and Kidder then engaged in a classified correspondence debating the issue. The correspondence was declassified in 2001. In 1997, Kidder argued against the Department of Energy's Stockpile Stewardship and Management Program, calling it "misguided in a number of ways", including introducing unnecessary changes in warhead materials, the cost of large-scale computational and experimental resources, and its effects on arms control efforts. He also criticized the building of the National Ignition Facility, saying it was not essential for stockpile stewardship. In 1999, Kidder co-authored an
op-ed article in
The Washington Post, favoring the
Comprehensive Test Ban Treaty then pending before the
United States Senate. In 2000, Kidder wrote to the Justice Ministry of
Israel regarding the
Mordechai Vanunu case, saying that he did not believe that Vanunu possessed any technical nuclear information that had not already been made public. (The Israeli government opposed Vanunu's release from prison in 1998, claiming he still possessed secret information.) Kidder resided in
Pleasanton, California. == Selected bibliography ==