National Association of Math Circles Wiki
Math Teachers’ Circle Network

The Math Teachers' Circle Network brings together Math Teachers' Circles (MTCs) throughout the United States. The mission of an MTC program is to establish the foundation for a culture of problem-solving by fostering the enjoyment of mathematics among middle school math teachers. This style of learning for teachers is based on the Math Circles environment that originated 150 years ago in Eastern Europe and has proven to be successful for students around the world.

Website: http://www.mathteacherscircle.org/