Mario R.L. Luna is a lawyer and a CPA. He also teaches at a number of colleges, including Professor of Remedial Law, College of Law, Polytechnic University of the Philippines, and Manila Law College. He also works as a Pre-Bar Review Lecturer at Remedial Law: PUP Bar Review Center, Villasis Law Center, and Lex Fortis Bar Review. He has extensive legal experience, having served as a Deputy City Prosecutor in Antipolo City and an Assistant Provincial Prosecutor in Surigao del Sur. He has also worked for the government, having previously served as an Attorney VI, Legal Office, Commission on Audit, Quezon City, and a State Auditor IV, Commission on Audit, Quezon City. His first books, Disquisition And Jurisprudence on Remedial Law Vol. 1, 2, 3, were recently published.