[1][2] His father, Augustus Ferdinand Eisen (1824-1870), was a Swedish-born immigrant to the United States.
[2] After living in Ohio, they settled in San Francisco, California, where Theodore grew up.
[3] They also designed several mansions on West Adams Boulevard in the Craftsman and Tudor Revival architectural styles.
[3] Eisen was a member of the American Institute of Architects and the Sunset Club in Los Angeles.
[1] Eisen married Annie Bennett (1858-1932), an Australian-born immigrant to the United States.