The Thach family of Athens, Alabama, included Eliza Lockhart Coleman Thach (1826-1918), an Athens Female College (Athens State University) alumni and educator; her husband, Robert Henry Thach, Sr. (1837-1866); their children: Charles Coleman Thach, Sr. (1860-1921), the sixth president of the Alabama Polytechnic Institute (now Auburn University) between 1902 and 1920, and a professor of English and Political Economy, Richard Harman Thach (1865-1888), and Robert Henry Thach Jr. (1866-1924). The collection also includes information related to Ellen Stanford Smith Thach (1867-1954), wife of Charles Thach; her father, Otis David Smith (1831-1905) who was a teacher of mathematics and interim president at the Alabama Agricultural and Mechanical College (Auburn University); their children, Harry Smith Thach (1901-1984), Richard Hartwell Thach (1898-1967), Charles Coleman Thach, Jr. (1893-1966), and Elizabeth Lockhart Thach Curtis (1887-1970). Also included is information related to Elizabeth Curtis’s grandson, Nathaniel Cortlandt Curtis, Jr. (1917-1997), who compiled much of the genealogical materials in this collection.