John Edward Warnock (born October 6, 1940) is an American computer scientist and businessman best known as the co-founder with Charles Geschke of Adobe Systems Inc., the graphics and publishing software company. Dr. Warnock was President of Adobe for his first two years and Chairman and CEO for his remaining sixteen years at the company. Although retired as CEO in 2000, he still co-chairs the board with Geschke. Warnock has pioneered the development of graphics, publishing, Web and electronic document technologies that have revolutionized the field of publishing and visual communications.