Parents

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Frederik Kaiser research assistant 1870-1871 Leiden
Pieter Leonhard Rijke grad student 1875 Leiden (Physics Tree)
 (Over de theorie der terugkaatsing en breking van het licht)

Children

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Hendrik Bremekamp grad student 1905 Leiden
Leonard Salomon Ornstein grad student 1908 Leiden (Physics Tree)
Adriaan Daniël Fokker grad student 1913 Leiden (Physics Tree)
Johannes Droste grad student 1916 Leiden
Marc de Haas post-doc 1893-1895 Leiden (Physics Tree)
Balthasar van der Pol post-doc 1919-1922 Teylers Institute in Haarlem (Physics Tree)
Gerhard Joan Elias research scientist Teylers Institute in Haarlem (E-Tree)