The illustrators who created the first "serious" clip art for business/organizational (professional) use were Mike Mathis, Joan Shogren, and Dennis Fregger; published by T/Maker in 1984 as "ClickArt Publications."
Dennis Hopper | Dennis Quaid | Dennis the Menace | Dennis Rodman | Dennis Miller | Dennis Potter | Dennis Haysbert | Dennis the Menace (1959 TV series) | Dennis Kucinich | Dennis Morgan | Dennis Lillee | Dennis Dart | Dennis Prager | Dennis Oppenheim | Dennis Waterman | Dennis Green | Dennis Franchione | Dennis | Sandy Dennis | Hugh Dennis | Dennis Morgan (songwriter) | Dennis Lehane | Dennis Adams | Dennis Wilson | Dennis Wheatley | Dennis Tito | Dennis O'Keefe | Dennis Cooper | Dennis Christopher | Dennis Brown |