michel gustave édouard mayor (born 12 january 1942) is a swiss astrophysicist. he was professor emeritus at the university of geneva's department of astronomy. he retired in 2007, but works as a researcher at the observatory of geneva. he is co-winner of the 2019 nobel prize in physics, the 2010 viktor ambartsumian international prize, and the winner of the 2015 kyoto prize.