Cees "Cornelis" Datema (1944-2004) was a Dutch academic with special focus on Latin and Greek and the preaching of the early church fathers. He obtained his PhD from Vrije Universiteit of Amsterdam in 1970 and his original thesis on Asterius of Amasea is still used in teaching the subject today. From 1987 to 1993 he was the Rector Magnificus of Vrije Universiteit Amsterdam following which he joined the board of the Open University of Amsterdam as its chairman.