He worked at the Leo Burnett agency in Chicago. The agency is noted for putting anthropomorphic faces of "critters" on packaged goods. He was the first to draw Tony the Tiger for Kellogg's[?] Sugar Frosted Flakes in 1952. Tennant was also in charge of the Marlboro account and invented the Marlboro Man.
wikipedia.org dumped 2003-03-17 with terodump