In 1967, becoming active again at University of Pennsylvania, Beck still described himself and his new therapy (as he always would quietly) as neo-Freudian in the ego psychology school, albeit focused on interactions with the environment rather than internal drives. He offered cognitive therapy work as a relatively "neutral" space and a bridge to psychology. With a monograph on depression that Beck published in 1967, according to historian Rachael Rosner: "Cognitive Therapy entered the marketplace as a corrective experimentalist psychological framework both for himself and his patients and for his fellow psychiatrists."