Colm Mulcahy (Born September 1958) is an Irish mathematician, academic, columnist, book author, public outreach speaker, and amateur magician, long on the faculty of Spelman College. In addition to algebra, number theory, and geometry, his interests include mathemagical card magic and the culture of mathematics–particularly the contributions of Irish mathematicians and also the works of iconic mathematics writer Martin Gardner. He is a frequent blogger for The Huffington Post, Scientific American, and an aperiodical blogger for The Aperiodical; his puzzles have been featured in The New York Times. Mulcahy serves on the Advisory Council of the Museum of Mathematics in New York City.