 Notable exhibitions during Mather's tenure included one of works by Paul Cézanne, borrowed from Duncan Philips, and one of highlights from the Museum of Modern Art.Before his retirement in 1946, he oversaw a massive influx of Antioch mosaics from the archaeological digs at Antioch-on-the-Orontes in which the University had played a leading part.Some of the mosaics can be found today not only in the museum but also in various places in Firestone Library.