• Ph.D. in Celestial Mechanics, Yale University, 1969.
• Former Chief, Celestial Mechanics Branch of the Nautical Almanac Office, U.S. Naval Observatory.
• Former consultant to the Jet Propulsion Laboratory and frequent contributor to scholarly technical journals and astronomy magazines.Author of Dark Matter, Missing Planets, and New Comets.
• Currently President of the MetaResearch Foundation in Washington, DC. http://metaresearch.org/