Clark is a teaching and research institution founded in 1887 and was the first all-graduate institution in the United States. Clark claims many firsts in the exploration of intellectual frontiers. The University's first president, G. Stanley Hall, earned the first Ph.D. in psychology in this country at Harvard. He founded the American Psychological Association and was the first to identify adolescence as a separate stage of human development. In 1907 Clark professor A.A. Michelson received the Nobel Prize for physics, becoming the first American to win a Nobel Prize in the sciences. Clark alumnus and professor Robert Goddard is known as the father of the space age because of his development and launch of the first liquid-fueled rocket. And alumnus and arctic explorer Paul Siple was the first to develop and measure the wind-chill factor. Explore the Clark Web site to learn more about ideas that originated at Clark and how current students and faculty are challenging convention and changing our world.