Randy LeVeque -- Mathematical Genealogy and Erdös Number

• Mathematics Genealogy -- My students and ancestors

• My academic family tree (also for all my students), going back to the 11th century. Our distinguished ancestors include Copernicus, Huygens, and Leibniz.
  Kindly produced by Christiane Helzel from Mathematical Genealogy Posters

• My Erdös number is officially 3 (via Gene Golub and Alan Hoffman). But I can claim it is 2.5 on good authority, since Peter Lax claimed his was 1.5, having been credited with a proof in a 1943 paper by Erdös (when Peter was 17), as recounted for example in Some Famous People with Finite Erdös Numbers.

• The MathSciNet Collaboration Distance tool is a good way to compute your own Erdös number, or collaboration distance from any other mathematician. (For example, I learned the fun fact that my son and my father have a collaboration distance of 4, with the shortest path passing through Paul Erdös. Which is not so surprising, since my father William J LeVeque was a number theorist with Erdös number 1).