Stonex began his corrections career in 1994 at the Warren County Regional Jail in Bowling Green, Kentucky, and quickly ascended to the rank of Captain/1st Shift Commander. Since 1999 he has worked for the Kentucky Department of Corrections Division of Probation and Parole, to include Probation and Parole Officer Grades I/II, Assistant District Supervisor D-2, 3rd District Supervisor and Administrative Branch Manager - Western Region.
Stonex earned a bachelor of science degree from Western Kentucky University and he is a graduate of the 2007 Kentucky Department of Corrections Commissioners Executive Leadership Program. Stonex has served as guest faculty at the Kentucky Department of Corrections Division of Training since 2005 specializing in Motivational Interviewing, Case Management Strategies and Evidence Base Re-entry Initiatives. Mark is a recipient of the 2009 Kentucky Department of Corrections Commissioners Award for his PORTAL Reentry Program. He is a member of the Kentucky Council on Crime and Delinquency (KCCD), Green River Gun Club and frequently volunteers at St. Joseph School.