Anneli Lax: They Think, Therefore We Are.

Anneli Lax (1922-1999) was my mentor and thesis advisor at New York University in the late 1980s. I was fortunate to be included among her circle of friends and collaborators in the ensuing years. Dr. Lax made important contributions to mathematics and mathematics education. This article describes her pioneering work in promoting good exposition of elementary mathematics in support of mathematics and its pedagogy. The design and implementation of her views illustrate her indefatigable spirit and impressive work ethic for causes she championed. [ABSTRACT FROM AUTHOR]