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John Hadley is today remembered as scientist who was the first who managed to significantly evolve Isaac Newton designs of reflecting telescope by the introduction of precision aspheric and parabolic speculum metal mirrors.
Johannes Kepler is without a doubt one of the most important scientists that contributed to the rise of Enlightenment, a scientific movement that significantly impacted the development of Renaissance Europe. Many of his most important discoveries happened because of his involvement with telescopes, which were introduced to them by none other than Galileo Galilei.
Zacharias Janssen is one of the three original spectacle-makers from Netherlands who claimed that he was the first persons who have discovered first modern telescope. Even though his claims were never confirmed, he managed to carve his way into our history.
In 1608, three inventors contacted Dutch government and asked from it permission to patent their original Telescope designs. One of those three was Jacob Metius, a famous spectacle-maker from Dutch city Alkmaar.