Warren Teitelman

Warren Teitelman (1941 to 2013) was an American computer scientist specializing in programming environments and artificial intelligence, best known for developing Interlisp, a comprehensive Lisp programming environment. He held positions at Bolt, Beranek, and Newman, Xerox PARC, Sun Microsystems, where he became the company's first Distinguished Engineer, Rational Software, and Google. His innovations in Interlisp included the Undo and Redo function, spelling correction, and the Do What I Mean feature that attempted to correct common typing errors. With Bob Sproull he pioneered the first client-server window system, called D-Lisp, in 1977, introducing overlapping windows and contextual help. He received the ACM Software System Award in 1992 for his work on Interlisp and was designated an official ARPANET Pioneer for his contributions to early network development.