K. C. Constantine was born Carl Constantine Kosak in McKees Rocks, Pennsylvania. After graduating from Westminster College, he worked as a journalist and as an English teacher at Seton Hill University. He turned to writing full-time in 1993. His detective novels, especially those featuring his idiosyncratic protagonist Mario Balzic, proved popular enough to lift Kosak to mystery stardom. However, he rarely capitalizes on his popularity for self-aggrandizement, preferring a quiet life with his wife Linda in Greensburg, Pennsylvania.