Parents

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Rudolph Snell van Royen (Snellius) research assistant Leiden
Ludolph van Keulen grad student 1607 Leiden
Johannes Kepler post-doc Prague (Physics Tree)
Tycho Brahe post-doc 1600-1601 Prague (Astronomy Tree)

Children

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Jacob Gool grad student Leiden
Franck Pieterszoon Burgersdijk grad student 1620 Leiden (Neurotree)