John Robert Huizenga (April 21, 1921 – January 25, 2014) was an American physicist who helped build the first atomic bomb and who also debunked University of Utah scientists' claim of achieving cold fusion.

Following his time in Oak Ridge, he continued his education at the University of Illinois, receiving a Doctor of Philosophy degree in physical chemistry in 1949.

[2] During World War II, Huizenga supervised teams at the Manhattan Project in Oak Ridge, Tenn., involved in enriching uranium used in the atomic weapon dropped on Hiroshima in August 1945.

During his Argonne years, as a result of examining debris from the "Ivy Mike" nuclear test in 1952, Huizenga was part of the team that added two new synthetic chemical elements, einsteinium and fermium, to the periodic table.

[13] In 1989, Huizenga co-chaired, with Norman Ramsey, a panel convened by the United States Department of Energy which attempted to debunk claims by two University of Utah chemists that they had achieved nuclear fusion at room temperature.

Specifically, no theoretical or experimental evidence suggests the existence of D-D distances shorter than that in the molecule D2 or the achievement of "confinement" pressure above relatively modest levels.

Following his retirement from Rochester, Huizenga and his wife moved to North Carolina, where he continued to serve on advisory committees at major accelerator laboratories, worked to debunk cold fusion, and wrote his memoirs.