Alfred Goodman Gilman is an American pharmacologist and biochemistborn in July 1, 1941 at New Haven, Connecticut. He shared the 1994 Nobel Prize in Physiology or Medicine with Martin Rodbell for their discoveries regarding G-Proteins. Rodbell has shown in the 1960s that GTP was involved in cell signaling. He became a professor of pharmacology at University of Virginia and elected as a member of National Academy of Sciences in 1986. In addition to the Nobel Prize, he won the Albert Lasker Award for Basic Science Research as well as Louisa Gross Horwitz Prize from Columbia University in 1989 together with Edwin Krebs winner of Nobel Prize in medicine in 1992. In 2005, he was elected as Dean of University of Texas Southwestern Medical School in Dallas, Texas.