===== Directors Leiden Observatory =====
|1629-1667    |**Jacob Gool**| +night assistent; teaching, popularisation|
|1668-1682|**Christiaan Melder**|mathematics|
|1682-1705|**Buchardus de Volder**|acquires lenses, mirror, clocks, sextant|
|1705-1708|**Lutharius Zumbach de Croesveld** |a.i. leaves for Kassel|
|1717-1742    |**Willem Jacob ’s Gravensande** |physics + explicitly astronomy|
|1742-1769     |**Johan Lulofs**|{{:history:venus_overgang_1761_lulofs.jpg?linkonly|}}|
|1763 |**J.A. Fas** |lector tot 1817, sometimes a.i.|
|1769-(1805)   |**Dyonisius v.d. Wijnpersse**|
|1793-1794      |**Pieter Nieuwland**|
|1799-1805      |**Frederik v. Beeck Calkoen**| leaves for Utrecht|
|1811-1826      |**C. Ekama**| from the closed Franeker University|
|1826-1837     |**P.J. Uylenbroek**| physics|
|1837-1861     |**F. Kaiser**|
|1872 |**W. Valentiner a.i.**|
|1872-1908|**H.G. v.d. Sande Bakhuyzen**|
|1908-1918    |**E. F. v.d. Sande Bakhuyzen**|
|1918-1934    |**W.de Sitter**| Student of Kapteyn {{:history:een_beknopte_geschiedenis_van_het_kapteyn_instituut.pdf|Astrononmical Institute Groningen}}|
|1935-1945    |**E. Hertzsprung**|
|1945-1970    |**J. Oort**|
|1970-1971    |**Hendrik van de Hulst**|
|1972-1974    |**Harm Habing**|
|1975-1987    |**Harry van der Laan**|
|1987-1991    |**William Butler Burton**|
|1991-1996    |**Harm Habing**|
|1996-2003    |**George Miley**|
|2003-2007    |**Tim de Zeeuw**|
|2007-2012    |**Koen Kuijken**|
|2012-2022    |**Huub J.A. Röttgering**| 
|2022-        |**Ignas Snellen**|