Michael EganMichael Egan is a coauthor of Fostering Geometric Thinking (2007) and its professional development companion The Fostering Geometric Thinking Toolkit (2008), both published by Heinemann.Hehas taught middle and high school mathemaics since 1995. While he continues to teach adolescents on a part-time basis, his current work focuses on mathematics education research and teacher education. Read More Read Less