He became assistant professor during the term of Dean Pacifico Agabin and started to do work as an academic administrator under the term of Dean Merlin M. Magallona .
Leonen joined the law faculty in 1989 as professorial lecturer in Philippine Indigenous Law .
Leonen became assistant professor during the term of Dean Pacifico Agabin and started to do work as an academic administrator under the term of Dean Merlin M. Magallona .
Leonen joined the law faculty in 1989 as professorial lecturer in Philippine Indigenous Law .