Computer science development of sophisticated computing equipment. Wilhelm Schickard designed and constructed the first working mechanical calculator in 1623. In 1673, Gottfried Leibniz demonstrated a digital mechanical calculator, called the Stepped Reckoner. He may be considered the first computer scientist and information theorist, for, among other reasons, documenting the binary number system. In 1820, Thomas de Colmar launched the mechanical calculator industry when he released his simplified arithmometer, which was the first calculating machine strong enough and reliable enough to be used daily in an office environment. Charles Babbage started the design of the first "automatic mechanical calculator", his Difference Engine, in
George Springer (mathematician) George Springer (mathematician) George Springer (born September 3, 1924) is an American mathematician and computer scientist. He is professor emeritus of computer science at Indiana University Bloomington. Springer is perhaps best known as the coauthor with Daniel P. Friedman of the widely used textbook "Scheme and the Art of Computer Programming". Scheme is one of the two main dialects of LISP. Three of the pioneering books for Scheme are "The Scheme Programming Language" (1982) by R. Kent Dybvig, "Structure and Interpretation of Computer Programs" (1985) by Harold Abelson and Gerald Jay Sussman with Julie Sussman, and "Scheme and the Art