I recently (as of 2007) made a diagram of my academic genealogy, which is the tree with my Ph.D. advisor as my parent, her Ph.D. advisor as her parent, and so on. This graph actually isn't quite a tree because some people have multiple advisors.

The genealogy is fascinating to view because it dates all the way back into the 1600's. Many famous mathematicians and computer scientists appear along the way, including Leibniz, Bernoulli, Euler, Lagrange, Poisson, Alonzo Church, Stephen Kleene, and Alan Turing.

I also included a couple graduate student friends of my mine who happen to be roughly nearby me in the same tree. The year in each node is the date of Ph.D. conferral (dates in the future are projections). Roots correspond to people who never formally received a Ph.D., or for whom no advisor information is available. Also, the fact that a node appears in the diagram doesn't imply that all it's children (i.e., Ph.D. students) do. Most of the advisors in the diagram had many students, but only the relevant ones are listed.

The diagram is based on information from the Mathematics Genealogy Project (which uses the term "mathematics" in a very inclusive sense which includes computer science). The data was compiled using this script, which can be easily modified to make genealogies including any set of people you chose.