Mazza began his career with the Department of Corrections in September 2003 as a correctional officer at the Kentucky State Reformatory (KSR). In 2005 he was promoted to sergeant and a year later was promoted to lieutenant. As lieutenant, he served as the internal affairs officer for the institution.
In 2007 Mazza was promoted to captain and later promoted to correctional industries manager. In 2012 he returned to security as an administrative captain and was promoted to senior captain in 2013.
Mazza has been recognized with numerous awards during his career, including employee of the month, volunteer of the year, and the DOC achievement award from KSR.