University of Waterloo Dept. of Applied Mathematics researchers are profiled in this video, prepared for the July 2011 International Congress on Industrial and Applied Mathematics. Sue Ann Campbell, Kevin Lamb, Matt Scott, Siv Sivaloganathan, and Marek Stastna discuss how their work helps to build tools used to tackle a broad range of problems that affect us all. Examples include fluid dynatics and acquatics, growth of bacteria and mathematical medicine.