In addition to his full-time work as a Papal secretary, Foster also served as a priest, tutored students, and had a weekly program on Vatican Radio, "The Latin Lover". Starting in 1977, he taught ten Latin courses a year at the Gregorian University in Rome. In 1985, responding to student requests, he added an eight-week summer school with classes meeting seven days a week. The summer school was free; the university fired him in 2006 for allowing too many students to take his classes there without paying. As a result, in November 2006 Foster founded his own free "Academia Romae Latinitatis", also known as the "Istituto Ganganelli", which as of 2007 was housed at Piazza Venezia in Rome.