Diane Casselberry has a BS in Mathematics/Economics with a minor in Psychology from the University of New Hampshire. She has taught a number of classes here at STA since the fall of 2003 including Algebra II, Geometry, Pre Calculus and Calculus.

Prior to coming to STA, Ms. Casselberry was employed at Cabletron doing Software Quality Assurance and Technical Writing. She continues to do consulting work in quality assurance.

Outside of school, Ms. Casselberry is an avid runner and triathlete, competing in many local events. She also enjoys spending time with her daughter, who is active in cheerleading, band and softball.