Harvard faculty typically don't use the Cambridge public schools. That's anecdotal based on acquaintance with 10+ faculty members. Those who live in Cambridge go private, but the faculty are increasingly priced out of Cambridge itself.
We have personal experience with Brookline and Newton. Newton uses Everyday Math (or did 5 years ago). Ugh. Brookline has wonderful educated teachers but has no programmatic accommodation for gifted. Individual teachers may be wonderful about a gifted kid. Or not. We had both.
The Weston snippet, I suspect, is aimed at the many, many parents who use Russian math (it's a freestanding after-school program with actual tests! gasp! and rankings of the kids! double gasp!) to supplement the school-based math, which is increasingly aimed at the 25th percentile so that they can pass the MCAS. Gifted and advanced kids receive no in-school acceleration in math (our experience in Brookline and Newton), and so parents send kids to Russian math. The context is that long division (long division!) is considered very challenging (!!!) for fourth graders in the schools. Sigh. There's a large educated population in both towns, and many STEM people, including from the former Soviet Union, so there's also a large population dissatisfied with the low level of math in the schools and open to the Russian math approach. So what happens is you have kids, say, 10 and doing pre-Algebra or Algebra via Russian math, and the schools make them sit in grade-level classes.
