Tom Johnson (astronomer)

Thomas Jasper Johnson or Tom Johnson (January 11, 1923 – March 13, 2012) was an American electronics engineer and astronomer who founded Celestron, a company which manufacturers telescopes, which revolutionized the amateur astronomy industry and hobby.Sky & Telescope magazine has called him, "among the most important figures shaping the last half century of amateur astronomy."

Johnson was born in 1923. He served as a military radar technician during World War II.

In 1955, Johnson, an engineer, established Valor Electronics, which produced electronics for military and industrial use. Valor, which was headquartered in Gardena, California, had more than one hundred employees by the early 1960s.

Johnson, who had a strong interest in amateur astronomy, originally created Celestron as the "Astro-Optical" division of Valor Electronics in 1960. Around 1960, Johnson had been looking for a telescope which could be used by his two sons, but found no such child friendly models on the market at the time. Johnson built a new telescope, a 6-inch reflector telescope, by himself, in 1960. Richardson Medal

On July 28, 1962, publicly unveiled a new invention, a portable  18 ³⁄₄-inch Cassegrain telescope at the party held by the Los Angeles Astronomical Society on Mount Pinos. The new transportable telescope proved so groundbreaking that Johnson's invention was featured on the cover of a 1963 issue of Sky & Telescope.

Johnson's interest in telescopes soon became a full-fledged business. Johnson's new company, Celestron, which descended from the "Astro-Optical" division of Valor Electronics, soon began selling more sophisticated Schmidt–Cassegrain telescopes in models ranging from just 4 inches to 22 inches. However, the Schmidt–Cassegrain telescope proved difficult to mass-produce because the models needed Schmidt corrector plate, an advanced aspheric lens, which could be hard to manufacture. To solve this production problem, Johnson and the company's engineers invented a new type of telescope, the Celestron 8, in 1970. The Celestron 8 was more compact, affordable and easier to manufacture than traditional telescopes, like the Schmidt–Cassegrain. Johnson's new telescope proved very popular in the amateur astronomy and educational industries, allowing the hobby to rapidly expand and reach more consumers.

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