[2] He was a professor emeritus at Harvard University (working from 1909 until 1950), focused as a historian of Spanish and Italian Renaissance art and iconography.

[2][1] Post attended Harvard University, his classmates included Franklin D. Roosevelt and Hayward Keniston,[2] and graduated in 1904, with a B.A.

[3] His thesis was titled, Castillian Allegory of the Fifteenth Century, with Especial Reference to the Influence of Dante (1909), and his doctoral advisor was Jeremiah D. M.

[3] Students of Post included John Dos Passos and Walter William Spencer Cook.

[2] His survey series, A History of Spanish Painting (spanning publishing dates 1930–1953) was fourteen volumes in length and extensive in details.