In 2004 he was the first high school teacher to be an invited speaker at the MAA’s MathFest. Steve Sigur also co-wrote a book with arguably the most famous mathematician of our time, John H. Conway. Aside from being a gifted mathematician - as the many testimonies of his students attest , Steve Sigur was, for nearly 30 years, a gifted teacher. When stricken with the same deadly brain cancer that recently afflicted Senator Edward Kennedy, he underwent experimental procedures at Duke University that enabled him to continue teaching for over a year; and incidentally, finish his triangle-shaped-full-color-with-software-included-book, The Triangle Book (not available yet).
As Philip Davis’ 1995 paper (pdf) points out, triangles have a long and rich history, from Euler’s Elements to the work of Emile Lemoine. To understand beyond 1995 The Modern Geometry of the Triangle you must read Sigur’s paper (pdf). His web pages are chock full of triangle math and other delights. But the crown jewel is a set of interviews the Paideia School did with him. Here he discusses his love for life.
Steve Sigur died last month.