proctor
noun
a person appointed to keep watch over students at examinations.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
That June, Professor Mackie, then a research fellow at Oxford, was proctoring an exam when he read an article in The International Herald Tribune about what Tostan had done.
From New York Times ● Oct. 15, 2011