National Association of Math Circles Wiki
SIGMAA on Math Circles for Students and Teachers

The SIGMAA on Math Circles for Students and Teachers supports Mathematical Association of America members who share an interest in developing, supporting and running Math Circles. It works to facilitate vertical integration of elementary, middle and high school students, their teachers, undergraduate and graduate students, and faculty up through high-level research mathematicians.

website:http://sigmaa.maa.org/mcst/