Dr. Colm Mulcahy is a mathematical magician. He bought his first book of math and magic by Martin Gardner in 1975, and later had the pleasure of getting to know the man himself. His own book on original mathematical card principles, Mathematical Card Magic: Fifty-Two New Effects, was published in 2013. He has written for MAA.org, the Huffington Post, Aperiodical, and Scientific American. He is Professor of Mathematics at Spelman College.
For more info about mathematician Martin Gardner and worldwide annual events in his honor, see celebrationofmind.org.