| Date | Person | Description |
|---|---|---|
| Fournier, Georges | Fournier collaborated with Boulliau on astronomical observations in Paris | |
| 1620 – 1627 | François, Jean | Direct exchange between François and Mersenne in Paris in the years 1620 – 1627 |
| Hell, Maximilian | Hell corresponded with a number of scientific academies such as in Paris, Copenhagen, Göttingen, Stockholm, Trondheim, and Bologna |