Colm Mulcahy is a professor of mathematics at Spelman College, in Atlanta, where he has
taught since 1988. He's currently on leave in the DC area. Over the last decade, he has
been at the forefront of publishing new mathemagical principles and effects for cards,
particularly in his long-running bi-monthly Card Colm for the MAA. Some of his puzzles
have been featured in the New York Times. His book
<a href="http://www.crcpress.com/product/isbn/9781466509764" target="_blank">Mathematical Card Magic: Fifty-Two New Effects</a> was published by AK Peters/CRC Press in 2013.
Colm is a recipient of MAA's Allendoerfer Award for excellence in expository writing, for
an article on image compression using wavelets.