Although several authors have anointed Charles Elton the father of invasion biology (e.g., Richardson and Pysvek 2007, 2008; Ricciardi and MacIsaac 2008), and Charles Darwin anticipated a remarkable number of the concepts that have shaped the modern field (Ludsin and Wolfe 2001), Harold Mooney is the most important figure in stimulating the explosive growth of invasion science that began in the 1980s (Simberloff 2011).