About Us

The Math Open at Andover (MOAA) is an annual mathematics competition for middle school students organized and run entirely by students at Phillips Academy Andover. Founded by Justin Chang ’19 and Andy Xu ’19, the first MOAA invited 130 students from across the world to the Andover, MA campus in October 2018. MOAA 2019 was a similar success, with 28 teams and 146 total competitors. In 2020 and 2021, MOAA was completely virtual, before offering both in-person and virtual options in 2022.


2025 Tournament Directors


Eddie is an Upper at Phillips Academy and serves as the Director of Registration. Besides math, he enjoys tennis, physics, and swimming.
Eugenia is an Upper at Phillips Academy and serves as the Director of Registration. Other than math, she enjoys dance, reading, and mock trial.
Angela is a Senior at Phillips Academy and serves as the Director of Outreach. She enjoys listening to music, watching shows, and playing cards in her free time.
Brandon is a senior at Phillips Academy and serves as the Problem Organizer. Aside from math, he enjoys swimming, astronomy, and watching movies.
Bill is an Upper at Phillips Academy and serves as the Webmaster. He also enjoys computer science, drawing, and playing frisbee.

2025 Associate Board


Ellie is a Lower at Phillips Academy and serves as the Registration Associate. She enjoys exploring physics, computer science, and music outside of math.
Satabhisha is an Upper at Phillips Academy and serves as the Outreach Associate. Other than math, she enjoys dancing and writing.
Niki is an Upper at Phillips Academy and serves as the Outreach Associate. She adores chemistry and physics, and in her free time, she likes reading, knitting, and working on her LEGO city with her younger brother.
Paige is an Upper at Phillips Academy and serves as the Associate Problem Organizer. Besides math, she enjoys tennis and hanging out with her friends.
Sophia is a Lower at Phillips Academy and serves as the Associate Webmaster. In addition to math, she enjoys painting, dancing, programming, sleeping, eating, and walking her cat and dog.