This study extends the research on the creative work process in teams by integrating personality traits, knowledge-sharing behavior, and transformational leadership. Analyses of multisource data from 347 members of 53 creative teams in 26 firms reveal the associations between heterogeneity of openness to experience in teams and team creativity (i.e., idea generation and idea development). Further, knowledge sharing mediated the relationships between personality heterogeneity and team creativity. Transformational leadership amplified the relationship between personality heterogeneity and idea development. Theoretical and practical implications are discussed.