From 1988 to 1995 I worked with elementary teachers in Northeast Kansas, running workshops and observing them in their classes; in the summer of 2002 I ran a workshop for high school teachers. I have been on many national committees and advisory boards, participate in several e-mail lists on mathematics education at both the K-12 and post-secondary levels. I was a member of the writing team of the NCTM Standards2000 project; our document, Principles and Standards of School Mathematics, appeared in April, 2000. More recently, in 2003 I was a member of the writing team of the Kansas K-12 Mathematics Standards.
I have written two semi-formal papers in mathematics education:
More informal publications on mathematics education include:
The major Web site in mathematics education is the Math Forum . It connects to just about every Web site worth knowing about in math ed, and has several of its own that it's developed. In particular, you might want to browse to find its Mathematicians in Math Education page, which documents things mathematicians have done and suggests things mathematicians can do in K-12, the page for the organization Mathematicians in Education Reform , the many pages people have developed about various areas of mathematics, pages of suggestions for classroom activities, pages on the history of mathematics, and so on and on and on and on...