A high school dropout, Muntz made fortunes by selling automobiles, TV receivers, and car stereos and tapes. He was credited with coining the abbreviation 'TV' for television, although the term had earlier been in use in call letters for stations such as WCBS-TV. Muntz produced and marketed the first black-and-white television receivers to sell for less than $100, and created one of the earliest functional widescreen projection TVs. He invented the practice that came to be known as Muntzing, which involved simplifying otherwise complicated electronic devices.

Muntz also pioneered car stereos by creating the Muntz Stereo-Pak, better known as the 4-track cartridge, a predecessor to the 8-track cartridge developed by Lear Industries. He was a pioneer in television commercials with his oddball 'Madman' persona an alter ego who generated publicity with his unusual costumes, stunts, and outrageous claims. Earl William ' Madman' Muntz (Janu– June 21, 1987) was an American businessman and engineer who sold and promoted cars and consumer electronics in the United States from the 1930s until his death in 1987.

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