Kronk was born in Granite City, Illinois, United States, on March 23, 1956.
He developed an interest in space at an early age, during the time of the first crewed space flights of project Mercury; however, it was Mariner 4's close-up images of Mars that appeared on television the night of July 14, 1965 that focused his interest to astronomy.
[1] Kronk received a bachelor of science degree in journalism from Southern Illinois University Edwardsville in 1981.
In the end, he had a minor in English and extended studies in mathematics, physics, and psychology.
His latest book project is Cometography, which is a six-volume series being published by Cambridge University Press.