(2012 - 2015): Gathering 4 Gardner (G4G), Chairman

(1993 - 2012): Gathering 4 Gardner (G4G), co-organizer

(2004 - 2008): Sponsoring organizer, East Bay Community Foundation K-12 Fairs

(2004): American Mathematical Society's "Arnold Ross Lecturer"

(2003 - now): Berkeley Math Circle

(2005 - 2008): Smithsonian Institution/National Science Resources Center

(2005 - 2006): Emeryville Public School Advisory Board

(2001 - 2005): Judge, American Math Society's Menger Prize at Intel Science Fair (2005: Chairman)

(1999 - 2002): Trustee, College Preparatory School, Oakland CA

(1986 - 1992): Trustee, Head Royce School (K-12), Oakland, CA