A UST alumnus, he started his professional art career as an editorial cartoonist for widely circulated publications . His cartoons - which will compare favorably with the works of the luminaries of Philippine editorial cartooning - are true political cartoons, because they are in most ways satirical and adversarial, and not mere paeans to the powers-that-be. Zulueta also a painter and had shown similarly powerful works in solo exhibitions here, Australia, and the United States.