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Robert Spiller lives in Colorado Springs with his wife Barbara. His three children and four grandchildren all live within shouting distance. A mathematician and mathematics teacher he is author of the Bonnie Pinkwater mystery series: The Witch of Agnesi, A Calculated Demise, and Irrational Numbers. His math teacher/sleuth uses math and her knowledge of historic mathematicians to solve murders in the small Colorado town of East Plains. Radical Equations is the fourth in the series, and Robert is working on the fifth Napier's Bones. After thirty five years in the classroom, Robert retired this year to write full time.