Georg Joachim de Porris or Rheticus (1514-1574) was a scholar (born in Austria) best known as a mathematician and astronomer, but who also was a physician among other activities.
He spent two years with Copernicus, studying under him. He later encouraged and supported Copernicus in arranging the publication of his long-delayed full account of his heliocentric model of the cosmos: [translated title] On the Revolutions of the Celestial Spheres. [A brief preliminary account of Copenricus's model had appeared in 1510 or soon after.] Rheticus also popularised Copernican ideas by publishing his own Narratio prima de libris revolutionum Copernici in 1540, making it entirely clear that he was discussing the ideas of Copernicus and not his own discoveries.
Rheticus went to Nürnberg to oversee the publication of On the Revolutions of the Celestial Spheres for the elderly Copernicus who lived in Frombork (Poland), but left before the book appeared as he was appointed to a position at the University of Leipzig. (The task was handed over to Andreas Osiander who was responsible for adding an unsigned preface claiming the book was intended as a model useful for calculation, but did not claim to be an accurate account of how the universe was actually organised.)
in 1552, Rheticus was accused of the rape of a young man, convicted (in his absence, as he had fled) of sodomy, and sentenced to be exiled from Leipzig for 101 years (in effect, for life). It was after this episode that he trained and worked as a medical practitioner.
