The theme of Mathematics Awareness Month for 2011 is "Unraveling Complex Systems". As part of this theme, the Notices this month includes an article about mathematics and cardiology. The issue also includes an article about small divisors in dynamical systems (an idea also consonant with complex systems). The mathematical topics are rounded out with an unusual treatment of Riemann surfaces. Finally, we offer recollections of noted mathematician Paul Malliavin.
--Steven G. Krantz, Editor