I trace my PhD ancestry back to a line of eminent German mathematicians and applied mathematicians. Each person listed in the table was the PhD advisor of the preceding person. This information was obtained from the Mathematics Genealogy Project.

#	NAME	PhD YEAR	PhD INSTITUTION
1	Michael Wendl (bio)	1994	Washington University
2	R. K. Agarwal (bio)	1975	Stanford University
3	Milton Van Dyke (bio)	1949	California Institute of Technology
4	P. A. Lagerstrom (bio)	1942	Princeton University
5	Salomon Bochner (bio)	1921	Universität Berlin
6	Erhard Schmidt (bio)	1905	Georg-August-Universität Göttingen
7	David Hilbert (bio)	1885	Universität Königsberg
8	Ferdinand von Lindemann (bio)	1873	Friedrich-Alexander-Universität Erlangen-Nürnberg
9	Felix Klein (bio)	1868	Rheinische Friedrich-Wilhelms-Universität Bonn
10	Julius Plücker (bio)	1823	Philipps-Universität Marburg
11	Christian Gerling (bio)	1812	Georg-August-Universität Göttingen
12	Carl Friedrich Gauss (bio)	1799	Universität Helmstedt (defunct 1810)
13	Johann Pfaff (bio)	1786	Georg-August-Universität Göttingen
14	Abraham Kästner (bio)	1739	Universität Leipzig
15	Christian Hausen (bio)	1713	Martin-Luther-Universität Halle-Wittenberg
16	Johann Wichmannshausen (bio)	1685	Universität Leipzig
17	Otto Mencke (bio)	1665	Universität Leipzig

My Erdös Number is 3. The Erdös Number is popular in the folklore of mathematics and is also studied as a formalized social network.

ERDÖS #	NAME	ERDÖS PUBLICATION LINK
0	Paul Erdös	-
1	Daniel J. Kleitman	Combinatorica 12, 287
2	Eric S. Lander	J. Comp. Biol. 6, 419
3	Michael C. Wendl	Nature 409, 860