[1][2] Koehler graduated from the University of Delaware’s College of Business and Economics in 1975[3] with a bachelor's degree in business administration.
[4] Koehler started his career with NCR Corporation in 1975, rising to be vice president.
From 2000 to 2003, he was vice president of the Teradata division of NCR's global field operations.
In 2003, he became senior vice president of the Teradata division of NCR.
[5] Koehler became president and CEO of Teradata after its 2007 spin off from NCR.