Dr. Earl T. Engle was a professor at the College of Physicians and Surgeons at Columbia University for 29 years and lived in Sanbornton, New Hampshire. His 35-year-long scientific career provided significant contributions to the field of endocrinology. His collaborative work with Dr. Philip E. Smith helped to elucidate the role of the anterior pituitary, especially in the regulation of gonadal function. The hormonal control of menstruation was another of his many scientific interests.