[1] The Athenaeum was designed by Gordon Kaufmann in the Mediterranean Revival style, with landscape design by Florence Yoch and Lucile Council, and opened in 1930.

It includes a restaurant, bar, private hotel rooms,[1] and serves as Caltech's Faculty Club.

Einstein stayed in the loggia during his annual winter visits to Caltech.

[3] Membership numbers over 4000 and includes Caltech faculty, staff, graduate students, undergraduate seniors, alumni, trustees, and Associates of the California Institute of Technology, and staff of the Jet Propulsion Laboratory (JPL), the Palomar Observatory, and the nearby Huntington Library and Art Gallery.

[1] Notable regulars at the Athenaeum Round Table have included: