Stickler taught at the Salesian Pontifical University as Professor of Canon Law and Church Legal History for eight years. From 1958 to 1966 he served as rector of the University, having previously served as Dean of the Canon Law Faculty since 1953.
Stickler was a professor at the Salesian Pontifical University for eight years, holding both the role of Professor of Canon Law and Church Legal History and serving as Rector from 1958 to 1966. He previously held the position of Dean of the Canon Law Faculty since 1953.