Proviso Mathematics and Science Academy (or PMSA) is a magnet high school in Forest Park, Illinois, USA. It is one of the newest schools in the Proviso Township High Schools District 209. It serves students in many towns in western Cook County including Forest Park, Berkeley, Broadview, Maywood, Melrose Park, Stone Park, Hillside, Bellwood, and Westchester among others. PMSA opened its doors to 126 freshmen in 2005. The current principal is Dr.