After graduating from university, Lee worked as a high-school teacher and a newspaper journalist. In 1974, he settled in Taipei and went to work for Cathay Advertising. There, he produced a series of ads on “ advertising aesthetics, ” “ advertising mechanics, ” and “ advertising philosophy ” in an effort to create an advertising “ guidebook ” based on his ideas about the field.
大學畢業後，李敏勇擔任過高中教師和報社記者，1974 年定居台北，進入國泰建業廣告任職，曾以「廣告美學」、「廣告力學」和「廣告哲學」為名製作系列企業廣告，嘗試把自己心目中的廣告文化觀點表達出來，希望成為某種備忘錄或指南。