He served as president pro tempore of Duke University (at the time named "Trinity College") during the absence of Braxton Craven in 1864–1865, and was a professor there for some 35 years, starting in 1857 and ending in 1892.

[2] He then opened a high school at Floyd Court House, Virginia.

From 1854 to 1857, Gannaway operated a high school in Germantown, North Carolina.

[3] He died at his farm in Trinity, North Carolina on June 5, 1910.

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