... This increase in conceptual sophistication has been matched by a proliferation of empirical summaries and meta-analyses. Between 1986 and 2010, meta-analyses of leader individual differences were published focusing on personality and motives (Bono & Judge, 2004;DeRue, Nahrgang, Wellman, & Humphrey, 2011;Judge, Bono, Ilies, & Gerhardt, 2002;Lord et al., 1986;Stewart & Roth, 2007), intelligence (Judge, Colbert, & Ilies, 2004), sex differences (Eagly, Johannesen-Schmidt, & van Engen, 2003;Eagly & Johnson, 1990;Eagly & Karau, 1991;Eagly, Karau, & Makhijani, 1995;Eagly, Makhijani, & Klonsky, 1992), and social capacities (Day, Schleicher, Unckless, & Hiller, 2002;Harms & Crede, 2010). These meta-analyses demonstrated significant corrected correlations between particular leader individual differences and various leadership outcomes. ...