Paul Johan Karlsen is a Norwegian-born writer, editor, and research-oriented psychologist. He holds an MA in psychology from New York University and a PhD in psychology from the University of Oslo, Norway. He lives in Oslo and New York City.

Paul Johan Karlsen is a Norwegian-born writer, editor, and research-oriented psychologist. He holds an MA in psychology from New York University and a PhD in psychology from the University of Oslo, Norway. He lives in Oslo and New York City.