In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Q: Context: From 1968 to 1970, he was a Visiting Professor of History at Harvard University. Link Information: none Answer: none
A: 
Who was the president of Harvard University when Ohloblyn began teaching history there as a visiting professor?