In the same period Brown served the Archaeological Institute of America as Trustee and Norton Lecturer. In 1963, however, Brown left Yale to return permanently to the American Academy in Rome, resuming the positions of Professor-in-Charge and Director of Excavations to which were added the responsibilities of the directorship of the Academy in 1965-1969. Nevertheless, these years saw him characteristically active both in Rome and in Ansedonia. In 1963 he made soundings in the church of Santa Maria in Aracoeli. At the invitation of the Archaeological Superintendency of Rome, he returned in 1964 to the Regia in the Roman Forum, a building of which he had made an architectural study during his years as a Fellow. The excavation of the Regia was to yield the most substantial evidence for early organization and development of the Forum since the work of Giacomo Boni at the turn of the century. In 1965 he resumed work at Cosa supervising fieldwork and the preparation of additional publications of the Cosa series, and the design, construction, and outfitting of the site museum, since 1981 the National Museum of Cosa.