Eastburn graduated from Columbia College in 1817. He was assistant minister in Christ church, New York, 1822-27, and rector of the Church of the Ascension, 1827-42. He was elected assistant bishop of Massachusetts and consecrated in 1842. In 1843 he succeeded the Rev. Alexander Viets Griswold as fourth bishop of Massachusetts and 40th in succession in the American episcopate. His publications included: Four Lectures on Hebrew, Latin and English Poetry (1825); Essays and Dissertations on Biblical Literattire (1829); Lectures on the Epistles to the Phillipians (1833). AMW probably met Rev. Eastburn through the Prince family of Lowell, MA.
Johnson, Rossiter (ed.), The Twentieth Century Biographical Dictionary of Notable Americans, Boston, 1904, vol. 3, p. 374.