Mayor of Chicago, 1856-1857
- Pro-Nebraska Democratic Party
- Elected 18th mayor of Chicago March 10, 1856; defeated Francis Cornwall Sherman (Anti-Nebraska Democrat)
- Inauguration: March 11, 1856
- Born January 13, 1805 in Canton, Conn.
- Son of a Revolutionary War officer
- Worked in mercantile pursuits and then in packing and shipping grain
- Served one term in the Legislature and twice as a delegate to the National Democratic Convention
- President of the Chicago Chamber of Commerce
- Had one son with his first wife, Miss Adaline Hopkins
- Died June 6, 1862 in Middletown, Conn.
- Gravesite is unknown
- Andreas, A.T. History of Chicago: From the Earliest Period to the Present Time. A.T. Andreas, 1884–86.
- "Death of the Hon. Thomas Dyer." Chicago Tribune, June 11, 1862, p. 4.
- Grossman, James R., Ann Durkin Keating and Janice L. Reiff, editors. Encyclopedia of Chicago. University of Chicago Press, 2004.