Shelley Harrison teaches criminal law, constitutional law, and other first-year law school subjects at LEX Law Prep, which prepares students for the MBE, essay, and performance test portions of the bar exam. He has served as a guest lecturer for the University of Southern California Gould School of Law and as a test preparation instructor for TestMasters (LSAT, GRE) and Princeton Review (LSAT). Harrison began his teaching career working as a teacher's aide in the Jackson Hearing Center at Fairmeadow Elementary School in the Palo Alto Unified School District.
Shelley Harrison volunteers for the Humane Party, the National Cat Protection Society, and the Community Emergency Response Team (CERT) program of Newport Beach, California. He completed California's basic Animal Law Enforcement Academy at the San Diego Humane Society.