Earl Smith Chicago, Illinois, United States   Dr. Irvine Page and a lab tech at Cleveland Clinic in the 1960s. 1960s. Provided by Cleveland Clinic. Accessed via Wikimedia Commons. CC BY 4.0 Irvine Page was a physician scientist who discovered angiotensin and serotonin and proposed the multifactorial etiology of hypertension. He was a prolific medical…