| Georges Rayet - Founder and first director | Astronome, led the observatory from 1878 to 1906. |
| Luc Picart - Director of the Observatory | Head of the institution from 1906 to 1937. |
| Gilbert Rougier - Director of the Observatory | Head of the institution from 1937 to 1947. |
| Sigmund Merz - Manufacturer of optical instruments | Provides the objective of the equatorial bezel in 1880. |
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