Rudolph de Harak, also Rudy de Harak (April 10, 1924 – April 24, 2002), was an American graphic designer. De Harak was notable as a designer who covered a broad spectrum of applications with a distinctly modernist aesthetic. He was also influential as a professor of design. De Harak's work was influenced by modernism and the International Typographic Style. He was also influenced by abstract expressionism, Dada, op art and pop art. for many New Yorkers, perhaps his most famous and enduring work is the clock on the exterior of 127 John Street in Lower Manhattan.