[2] He traveled to Liberia in 1830 as part of the colonization effort by the American Colonization Society, where he was appointed by the Baptist Board of Foreign Missions as the head of their mission in Liberia.
Within one year of his family's arrival in Liberia, his wife and all five of his children had died of disease.
[3] Day served as a delegate from Grand Bassa County to Liberia's constitutional convention and signed both of its Declaration of Independence and its Constitution.
[4] He served as President Pro Tempore of the Senate of Liberia in the 1840s.
[5] In 1854, he was appointed to the Supreme Court by President Joseph Jenkins Roberts, serving as the second Chief Justice of Liberia.