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From the Principal

Being a Principian means learning how to think clearly, vigorously, fearlessly, tolerantly, and unselfishly.

Welcome message

The bell for the first day of school hasn’t quite rung yet, but Principia’s robotics program is all revved up and ready to forge ahead!

With robotics...

Upper School mathematics teacher Jim Moser (C’04) has been named a 2015 Teacher of Distinction by the Independent Schools of St. Louis. This nonprofit,...

Principia School
at a Glance

The program, the people, the place . . .
Take a quick look at Principia School.

Fast Facts

Robotics Team Wins State Competition

Upper School Robotics Team Optimus Prin and robot “Bolts” collaborated in a successful three-team alliance at the Missouri State FIRST Robotics Championship in May.

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Learn, Grow, Play . . .
and Live Here

Boarding at Principia provides so many opportunities for growth and friendship—and prepares students for life well after high school.

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Principia in Pictures

See our students in action.

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