One difficulty facing many Math Circles is the sad fact that most don't survive their founder leaving. At gatherings of Math Circle directors, I have been known to gloat that the San Diego Math Circle is one of the few that hasn't had this problem, because for a couple years now, the San Diego Math Circle has been run entirely by the parents, mainly David Brown. Not only has the Math Circle continued, but it has
thrived. Congrats to all the students, and to all the parents who continue to make the Math Circle so special.