Carl Kosak is an American mystery author known for his work as KC Constantine.

Little is known about Kosak, as he prefers anonymity and has given only a few interviews. He was born in 1934 and served in the Marines in the early 1950's.

Other than that, information is sketchy. He may have been a minor league baseball player (some even suggest that Kosak is a pseudonym for Phil Rizzuto) and he may have studied at the University of Iowa's writer's program in the 1960's.

Kosak continued to work a day job until 1993, when he lost his job and turned to writing fulltime.

His most famous creation is Mario Balzic, police chief in fictional Rocksburg, Pennsylvania. Kosak is much more interested in the people in his novels than the actual mystery, and his later novels become ever more philosophical, threatening to leave the mystery/detective genre behind completely.

Bibliography

• The Rocksburg Railroad Murders (1972) #
• The Man Who Liked to Look at Himself (1973) #
• The Blank Page (1974) #
• A Fix Like This (1975) #
• The Man Who Liked Slow Tomatoes (1982) #
• Always a Body to Trade (1983) #
• Upon Some Midnights Clear (1985) #
• Joey's Case (1988) #
• Sunshine Enemies (1990) #
• Bottom Liner Blues (1993) #
• Cranks and Shadows (1995) #
• Good Sons (1996) #
• Family Values (1997) #
• Brushback (1998) #
• Blood Mud (1999) #
• Grievance (2000) #
• Saving Room for Dessert (2002)

# Mario Balzic series