PRINTS has been in San Mateo since 1994 and in Emeryville longer. It is an accredited Montessori school that has bilingual education in either Japanese or Mandarin. They accept children as young as 18 mos. and go until middle school, although they have advertised they will be starting a high school in 2008. One big plus is that they potty train your child -- kids aren't required to be potty trained when they start, but are required to be put into training pants when they start.
It is an excellent Montessori school that is small and dedicated to the students and families. The Japanese program is excellent and has wonderful, caring teachers. Our sons have been in the school for 4 years and we plan on continuing there for years to come.