I founded Numeracy Works in 2008 with one product prominent in my mind - Tabula.  My goal was to create the teaching and learning tool that I wished for but couldn’t find.  My hope was that experience teaching math and technology would allow me to create a program that would be useful to others as well.

Who am I?  My name is David Hartmann.  For ten years I taught geometry and ran a computer lab at Meigs Magnet School which is a middle school in Nashville Tennessee.  For two years I taught a course on instructional technology at Tennessee State University.  I also taught Geometry and Applied Problem Solving at Evans High School in Evans Georgia.  I currently am working full time on developing Tabula.

Tabula is built upon a dynamic geometry library developed by Kirill Osenkov to which I also contribute.  This library together with an interface also created by Kirill is called Live Geometry and can be viewed at livegeometry.com.  The code to Live Geometry is open source and available through his codeplex project.