 Founded in 1915 by theater aficionado and philanthropist Christine Wetherill Stevenson, the institution hosts art exhibits, theater and music workshops, poetry readings, lectures, concerts and recitals.The Alliance is housed in the historic Wetherill mansion, which was designed in 1906 by Frank Miles Day and constructed by Thomas M. Seeds, Jr.The building was listed on the Philadelphia Register of Historic Places on April 28, 1970, and is also listed on the National Register of Historic Places as part of the Rittenhouse National Register Historic District.