• The Mathematical Sciences Research Institute (MSRI) at U.C. Berkeley
  sponsors an organization that provides a support structure for Math
  Circles − the National Association of Math Circles (NAMC).
  
  
• The Art of Problem Solving Foundation (AoPSF) helps to support the Santa Barbara
  Math Ellipse and several other Math Circles.
  It is affiliated with The Art of Problem Solving (AoPS), the premier online resource for
  top math students, which offers classes, a community forum, and lots more.
  
  
• SB Family School (SBFS) is the organizer of the Santa Barbara Math Ellipse.
  SB Family School also offers enrichment math classes, math teams, math camps
  and other math-related activities, for elementary to high school students in the
  Santa Barbara area.