LaGrange
                           /     \
                     Poisson     Fourier
                          \      /
                          Dirichlet
                          /      \
                   Lipschitz     Julius Puecker
                   Berlin 1853    Marburg 1823
                          \       /
                        Felix Klein             Karl Weierstrass
                        Bonn  1868              Koenigsberg 1854
                            |                      |
                       Lindemann                Frobenius
                    Erlangen-Nuernberg 1873     Berlin 1870
                        |                          |
                    David Hilbert               Edmund Landau
                    Koenigsberg 1885            Berlin 1899 
                        |                         |
                    Hermann Weyl          Paul Bernays
                    Goettingen 1909       Goettingen 1912
                                \          /
                             Saunders MacLane
                             Goettingen 1934
                                   |
                              Irving Kaplansky
                               Harvard 1941 
                                   |
                              Alex Rosenberg
                              Chicago 1951
                                   |
                              Victoria Powers
                              Cornell 1985