Glenn Theodore Seaborg (April 19, 1912 – February 25, 1999) was an American scientist who won the 1951 Nobel Prize in Chemistry for "discoveries in the chemistry of the transuranium elements", contributed to the discovery and isolation of ten elements, and developed the actinide concept, which led to the current arrangement of the actinide series in the periodic table of the elements. He spent most of his career as an educator and research scientist at the University of California, Berkeley, where he became the second Chancellor in its history and served as a University Professor.