Eric Wolfgang Weisstein (born March 18, 1969) is an American mathematician and encyclopedist who created and maintains the encyclopedias MathWorld and ScienceWorld. In addition, he is the author of the CRC Concise Encyclopedia of Mathematics. He works for Wolfram Research. Education Weisstein holds a Ph.D. in planetary astronomy, which he obtained from the California Institute of Technology's Division of Geological and Planetary Sciences in 1996 as well as an M.S. in planetary astronomy in 1993 also from Caltech. Weisstein graduated cum laude from Cornell University with a B.A. in physics and a minor in astronomy in 1990. During his summers away from Cornell, Weisstein participated in research at the Arecibo Observatory, a radio telescope facility in Puerto Rico operated by Cornell. As a graduate student, Weisstein also participated in research at Goddard Space Flight Center in Greenbelt, MD. During his time at Goddard, Weisstein participated in the development of hurricane visualization software. In 1996 Weisstein published his doctoral thesis titled Millimeter/Submillimeter Fourier Transform Spectroscopy of Jovian Planet Atmospheres, which was completed under faculty advisor Dewey Muhleman and in association with Eugene Serabyn, who is now a member of the Caltech Jet Propulsion Laboratory. Career Academic research Upon completion of his doctorate, Weisstein became a research scientist at Caltech in January 1996 and continued work in the field of submillimeter spectroscopy. He collaborated with Eugene Serabyn and published several papers. Six months later, he moved to the University of Virginia's Department of Astronomy in Charlottesville, VA where he remained for three years to continue his research. MathWorld, ScienceWorld, and Wolfram Research In 1995, Weisstein converted a Microsoft Word document of over 200 pages to hypertext format and uploaded it to his webspace at Caltech under the title Eric's Treasure Trove of Sciences. After Weisstein transferred to the University of Virginia to continue his work in astronomy, he continued to refine his fledgling encyclopedia. In November 1998, Weisstein made a deal with the CRC Press to publish his encyclopedia in book format as the CRC Concise Encyclopedia of Mathematics. A year later, in 1999, Weisstein accepted the position of encyclopedist at Wolfram Research, Inc. (WRI). MathWorld was ready to be unveiled in December 1999 with nearly 13,000 entries, most of them written by Weisstein, encompassing a variety of disciplines, including algebra, geometry, calculus, discrete mathematics, topology, number theory, statistics, and the foundations. MathWorld became involved in a legal dispute with the CRC