Bruce Tuckman was an American psychologist best known for his work in group dynamics. In 1965, he introduced the Tuckman's stages of group development, which outlines the phases teams typically go through: forming, storming, norming, performing, and adjourning. This model helps understand how teams evolve and improve their effectiveness over time. Tuckman's research has had a significant impact on fields such as organizational behavior and team management. His insights are widely used in various settings, including businesses, education, and therapy, to enhance collaboration and productivity among team members.