Here is a video interview with one of the authors of the ATTC book. While I disagree with the approach of the book, Henri is as good an example of a master teacher that I can think of.
On Oct 18, 2012, at 7:19 PM, calem <firstname.lastname@example.org> wrote:
> Hello, my name is Cale Moore and I am a product design > student at the University of Kansas. For my senior thesis, > I am designing a series of math manipulatives for higher > levels of math (trigonometry, precalc, calc, algebra, > etc.). If you are a secondary math teacher, it would > greatly help my project if you would fill out a short > survey concerning your use of manipulatives in the > classroom. Please follow the link below to participate. > > http://mathforum.org/kb/forumindex.jspa > > Thanks, Cale Moore