 After retiring from the University of Kansas City, Spaeth became a lecturer at Haverford College and taught Shakespearean literature at the adult educational program in Merion, which was attended by many prominent Philadelphia educators.Spaeth was the author of several papers on English literature, and was a member of the American Academy of Political and Social Science, the Modern Language Association, Phi Beta Kappa and various other societies

Spaeth's first wife, Marie Tinette Hauhgton, died in 1937.He married Mrs. Amy Fielding, widow of the architect Mantle Fielding, in 1942.