Assistant Professor at the Faculty of Medicine of the Catholic University of Rome (1972). Associate 
Professor for the teaching of Surgical Techniques in Orthopaedics (1980). Head of the Section of Spine Surgery at the same Institution (1989). Professor of "Spine Surgery" at the Catholic University of Rome (1991). Chief of the Division of Traumatology (1996). Professor (first band) of Orthopedics and Traumatology from 1997 to October 31, 2011. Chief of the Division of Spine Surgery, Policlinico Gemelli, Rome (1997). Director of the Department of Orthopaedics and Traumatology 2006 to 31 October 2011. Director of the School of Specialization in Orthopedics and Traumatology, Catholic University in the academic years 2003/2004 - 2010/2011. Member of the Italian Society of Orthopedics and Traumatology - SIOT. Member of the Italian Society of Spine Surgery - Italian Group Scoliosis - GIS, for which he also became President (2002). He was a Founding Member of the Cervical Spine Research Society, European section - CSRS ES, for which he later became President. Member of the Scoliosis Research Society - SRS. Member of Spine Society of Europe - SSE. Visiting Professor at the “Twin Cities Scoliosis Center” Department of Orthopaedic Surgery University of Minnesota (1976). "Research Fellow in the study, practice and surgery of Spinal Disorders" at the Department for Spinal Disorders at the "Robert Jones and Agnes Hunt Orthopaedic Hospital", Oswestry, UK (1977).
