Dr. Sian Leah Beilock is the 19th president of Dartmouth. A cognitive scientist by training, Beilock is one of the world’s leading experts on performance under pressure. She is one of the world’s leading experts on the brain science behind “choking under pressure” and the factors influencing all types of performance: from test-taking to public speaking to sports, and advises the world’s leading companies and government organizations on how to cultivate optimal performance.