Blankenship earned a bachelor's degree in criminal justice from the University of South Alabama. He worked for the Alabama Department of Conservation and Natural Resources (ADCNR) as a marine resources enforcement officer and rose to the position of director of marine resources in 2011.[2]

Blankenship was named deputy commissioner of the ADCNR in March 2017 and acting commissioner in May 2017 following the resignation of N. Gunter Guy Jr. Alabama Governor Kay Ivey appointed Blankenship to the role of ADCNR commissioner in August 2017.