* Michael Maestlin: This was Kepler's professor at the University of Tübingen. Maestlin was a strong advocate for the Copernican model of the solar system and taught Kepler the principles of astronomy and mathematics. He instilled in Kepler a deep curiosity about the universe and its workings.
* Tycho Brahe: This Danish astronomer employed Kepler after his university years. While Brahe was known for his meticulous observations, he was initially skeptical of the Copernican model. However, he saw potential in Kepler and entrusted him with analyzing his vast collection of astronomical data. This collaboration proved crucial for Kepler's development of his three laws of planetary motion.
* Bartholomäus Scultetus: While not a scientist, Scultetus was Kepler's patron and friend. He helped Kepler financially and supported his research. Scultetus even allowed Kepler to use his own printing press for publishing his works.
Therefore, while Kepler didn't have a singular mentor, these individuals - Maestlin, Brahe, and Scultetus - played vital roles in his scientific journey, offering guidance, support, and access to resources that ultimately shaped his career and legacy.