It was founded in 1953 by Paul Janssen. Janssen Pharmaceuticals, Inc. provides pharmaceutical products. Janssen Pharmaceuticals (formerly Centocor) is a pharmaceutical company that conducts research and development activities related to a wide range of human medical disorders, including mental illness, neurological disorders, anesthesia and analgesia, gastrointestinal disorders, fungal infection, HIV/AIDS, allergies and cancer. Janssen Pharmaceuticals, Inc. manufactures, markets and/or distributes more than 51 drugs … Explore Janssen’s innovative medical research & pharmaceutical product development practices to see how Janssen is creating a future where disease is a thing of the past. Janssen Pharmaceutica is a pharmaceutical company headquartered in Beerse, Belgium and owned by Johnson & Johnson.