Donald Machholz
Donald Edward Machholz (October 7, 1952 – August 9, 2022) was an American astronomer. He was a well known visual comet discoverer. It was said he helped discover 12 comets. Machholz spent more than 9,000 hours comet-hunting in a career, which lasted over 50 years. Machholz was one of the inventors of the Messier Marathon.