Precalculus

David Arias received his bachelor's degree in civil engineering from the Universidad Nacional de Ingenieria, Peru, in 1980. He worked in the construction industry in Peru until 1988. He earned his MS in mathematics at Salem State College in 1994 and worked at Fenway Middle College High School until 1996. He earned his EdD in mathematics and science education at the University of Massachusetts, Lowell, in 2002. He taught mathematics and computer science at Andover High School until 2012. Arias has taught at the Harvard Extension School, the Harvard Summer School, and the Harvard Kennedy School for over 27 years.