These images capture the remarkable but largely hidden collaboration between Thomas Eugene McKeller and the renowned painter John Singer Sargent. In early 20th-century Boston, McKeller—who worked as a hotel elevator operator—modeled for Sargent as the physical reference for many of the monumental male figures in the artist’s murals at the Boston Public Library and Museum of Fine Arts. While McKeller’s body shaped some of Sargent’s most celebrated images, his identity was largely erased as those figures were transformed into idealized white mythological gods. Their complex artistic partnership—one man seen, the other remembered—now inspires the opera American Apollo, which reimagines the human story behind the creation of these iconic works.