Dan taught mathematics at the middle school, high school, community college, and university levels for the past 46 years. What struck him at all levels of teaching was how those who struggle with math have holes in their basic skills foundation.

Dan became a math teacher at age 26 and absolutely loved discovering how to help a wide range of young people understand and appreciate mathematics. He began teaching at a large middle school where the students were not grouped by ability. As a new teacher, Dan learned to focus on each student and how to individualize their instruction. He quickly embraced teaching to mastery. Dan is always eager to sit down and talk about how demanding, time consuming, and wonderful it was to engage kids using an individualized instruction model.