Roger Guillemin is one of the founders of the field of neuroendocrinology, the study of the interaction between the central nervous system (such as the brain) and endocrine glands (such as the pituitary , thyroid, and pancreas). Guillemin focused his research on hormones produced by the brain, and their subsequent effect on body processes. He proved the correctness of a hypothesis first proposed by English anatomist Geoffrey W. Harris that the hypothalamus releases hormones to regulate the pituitary gland. For discoveries which led to an understanding of hypothalamic hormone productions of the brain, Guillemin and fellow endocrinologist Andrew V. Schally shared the 1977 Nobel prize for physiology or medicine with physicist Rosalyn Sussman Yalow. Guillemin and Schally were pioneers in isolating, identifying, and determining the chemical nature of such hormones as TRF (thyrotropin-releasing factor which regulates the thyroid gland ), LRF (luteinizing-releasing factor which controls male and female reproductive functions), somatostatin...