In I968 he was founder with George Serracino-Inglott of the Youth Section of Din L-Art Helwa and was responsible for the discovery of and initial rehabilitation programme of the Late Medieval Church of the Annunciation at Hal Millieri.
Prof. Buhagiar is the author of specialised books and studies on art and archaeology, and he has read papers on art historical and related topics in various international seminars and been guest lecturer in several universities and Fine Arts Institutions in Europe.