Mayor of Chicago, 1843-1844, 1845-1846
- Democratic Party
- Elected seventh mayor of Chicago March 7, 1843; defeated Thomas Church (Whig) and Henry Smith (Liberty)
- Invalidated election March 7, 1844; defeated George W. Dole (Whig) and Henry Smith (Liberty)
- Elected ninth mayor (second term) March 5, 1845; defeated John H. Kenzie (Whig) and Henry Smith (Liberty)
- Inauguration to first term: March 7, 1843
- Invalidated election: March 7, 1844
- Inauguration to second term: March 10, 1845
- Born 1801 (date unknown) in New York, N.Y.
- Served as alderman from 1840 to1843
- Ran a very successful auction room
- Garrett and his wife had no children; they left their estate to found Garrett Biblical Institute. The institute merged with Chicago Training School and Evangelical Theological Seminary to form Garrett-Evangelical Theological Seminary, the graduate school of theology at Northwestern University.
- Died November 30, 1848 in Chicago
- Buried in Rosehill Cemetery, Chicago
- Andreas, A.T. History of Chicago: From the Earliest Period to the Present Time. A.T. Andreas, 1884–86.
- Grossman, James R., Ann Durkin Keating and Janice L. Reiff, editors. Encyclopedia of Chicago. University of Chicago Press, 2004.
- Visitors Guide to Historic Rosehill. Rosehill Cemetery & Mausoleum, 1987.