The name "ThinkPad" is a product of IBM's corporate history and culture. Thomas J. Watson, Sr., had first introduced "THINK" as an IBM slogan in the 1920s. With every minicomputer and mainframe IBM installed (almost all were leased - not sold), a blue plastic sign was placed atop the operator's console, with the "Think" command on an aluminum plate. For decades, IBM distributed small notepads with the word "THINK" emblazoned on a brown leatherette cover to customers and employees. The name "ThinkPad" was suggested by IBM employee Denny Wainwright, who had a "THINK" notepad in his pocket. The name was opposed by the IBM corporate naming committee as the names for IBM computers were all numeric at that time. "ThinkPad" was kept due to praise from journalists and the public.