Research on hidden profiles reveals that groups often have trouble utilizing unshared information and making the optimal decision in decision-making contexts. However, a directive group leader advocating the best decision can help a group overcome this problem. The current study examines how a leader's access to information affects the quality of group decisions and information sharing. In addition, how leader selection processes affect leader influence is considered. Overall, evidence is found indicating a leader's access to information and leader selection processes influence group discussions and decision quality. (PsycINFO Database Record (c) 2010 APA, all rights reserved)