Lyman Spitzer Jr. — Biographical Profile

Lyman Spitzer Jr. is widely regarded as the father of magnetic confinement fusion in the United States. In 1951, while skiing in Aspen, he conceived the stellarator — a toroidal device whose helically twisted magnetic field lines could in principle confine a hot ionized gas long enough for fusion reactions to occur. He persuaded the U.S. Atomic Energy Commission to fund Project Matterhorn at Princeton, which later became the Princeton Plasma Physics Laboratory and ran the Model A, B, and C stellarators through the 1960s. Beyond fusion, Spitzer published the foundational textbook Physics of Fully Ionized Gases (1956), derived the Spitzer resistivity of a plasma, and was the first to formally propose a large optical telescope in orbit above Earth's atmosphere — a proposal that became the Hubble Space Telescope. His influence on both plasma physics and observational astronomy is structural rather than incremental: he defined the questions the field still works on.