The limited behavioral genetics research reported in the leadership literature has not investigated the degree to which early life experiences predict future emergence into leadership roles. This is the first study to focus on parenting style and early life experiences of rule breaking, and their relationships to leadership roles assumed in adulthood, while controlling for genetic and personality contributions. Using a sample ofmale twins reared together,we found that authoritative parenting practices was negatively related to modest and serious rule breaking, while being positively related to emergence in leadership roles into adulthood. We also found that modest rule breakingbehaviorpositivelypredicted thenumberof leadership roles takenonby individuals,while serious rule breaking negatively predicted the number of leadership roles. Implications for future leadership research and practice are discussed. © 2009 Elsevier Inc. All rights reserved.