Detailed Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Q: Context : Stephen Nissenbaum (A.B. Harvard College, 1961; M.A. Columbia University, 1963; Ph.D., University of Wisconsin--Madison, 1968 ), is Professor Emeritus of the History Department, University of Massachusetts at Amherst, specializing in early American history through to the nineteenth century.
Answer : Columbia University
A:
Where did Stephen Nissenbaum study or work?