Henry Nehemiah Tisdale (born 1944)[1] is an American retired academic administrator, educator, and mathematician.

[6] He earned a Bachelor of Science degree in mathematics from Claflin University in 1965, graduating magna cum laude.

[8][5] Tisdale pursued further studies in mathematics at Dartmouth College, where he earned both a Master of Arts (M.A.)

[8][5] His doctoral dissertation, titled "On Methods for Solving Optimal Stopping Problems", was supervised by Professor James Laurie Snell.

[11] Tisdale began his professional career as a mathematics educator in the Philadelphia School District, where he taught from 1965 to 1969.