MISH (Masters Interested in Sharing and Helping) is a long-standing club on campus. Students involved with MISH represent a distinct ethos of generosity, thoughtfulness, and community involvement that extends beyond the School. Although MISH is led by 12 officers in grades 9 to 11 and four co-chairs in grade 12, all Masters students are members of MISH.
There are several MISH activities that take place throughout the school year:
 
Co-Curriculars: Students sign up for an afternoon community service program and volunteer with local organizations during each school term.
 
Guest Speakers: At designated Morning Meetings, MISH invites a guest speaker to talk about their organization, cause, or issue to help raise awareness.
 
Annual Events: Events include: Midnight Run, Touring Talent, Thanksgiving Food Drive, Holiday Toy Drive, and the Senior 4 Senior Prom.
 
Grade Projects: MISH grade officers develop and implement a project in which the entire grade participates.