Instead of returning to MIT, Peters went to Spring Green, Wisconsin, to join Frank Lloyd Wright's Taliesin Fellowship as, apparently, its first apprentice when it began in 1932.

[1] Among his accomplishments were assisting Wright in the construction of Fallingwater, in Stewart Township, Fayette County, Pennsylvania, and the Johnson Wax administration building in Racine, Wisconsin.

[1] In 1990, he gave an interview to Wolfgang von Freeden from Lübeck, Germany, about his life and work, including his part in realising the Pearl Palace with the help of glass craftsmen from Murano, Italy.

[8] Peters later briefly married Svetlana Alliluyeva (1926–2011),[10] the youngest child and only daughter of Joseph Stalin,[9] in a union arranged by his former mother-in-law, Olgivanna Lloyd Wright.

Before divorcing in 1973, the couple had one daughter:[12][13] The William Wesley Peters Library at The School of Architecture headquartered in Paradise Valley, Arizona (formerly at Taliesin), which contains a collection of over 32,000 volumes, is named in his honor.