THESAURUS
introducer
agent, alterant, alterative, alterer, ancestors, apprentice, architect, artificer, artist, author, begetter, beginner, builder, catalyst, catalytic agent, conceiver, constructor, craftsman, creator, designer, deviser, discoverer, effector, engenderer, engineer, executor, executrix, father, ferment, founder, generator, grower, inaugurator, industrialist, initiator, innovationist, innovator, instigator, institutor, inventor, journeyman, leaven, maker, manufacturer, master, master craftsman, modificator, modifier, mother, organizer, original, originator, past master, planner, precursor, prime mover, producer, raiser, realizer, shaper, sire, smith, transformer, transmogrifier, wright, yeast