Colm Mulcahy (colm@spelman.edu) has been exploring mathematical card tricks in earnest for several years now, and never tires of inflicting his latest favourite one on anyone who will listen. For more on mathematical card tricks, including a guide to topics explored in previous Card Colms, see http://www.spelman.edu/~colm/cards.html.
Colm hails from Ireland, where he earned batchelor's and master's degrees in Mathematical Science at UCD. He then went to Cornell — more or less along arcs of two great circles — where he did research in the algebraic theory of quadratic forms for his PhD, under Alex FTW Rosenberg. He's been in the Spelman College department of mathematics since 1988. His music and food fetishes far predate his recent obsession with mathematical card tricks.