Brown taught high school mathematics at Phillips Exeter Academy from 1962 until his retirement in 1997. His other affiliations include the Newton High School in Massachusetts, the University of New Hampshire, Arizona State University, and the North Carolina School for Science and Mathematics during the school year beginning in 1983.
Brown had been offered a job at the National Security Agency at one time, but declined due to his desire to not move his family out of New Hampshire.
He is currently a member of the COMAP Consortium Council, he is an active participant in professional mathematics organizations and the author of mathematics texts and journal articles. In 2004, he was chosen by President George H.W. Bush to receive the "Presidential Award for Excellence in Science and Mathematics Teaching".
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