Richard Pierson is the CEO and co-founder of Headspace, the meditation app used by millions of people in more than 190 countries. Struggling to deal with stress and anxiety in his life, Pierson left a successful career in advertising. But when his struggles only got worse, he took up meditation, coached by Buddhist monk Andy Puddicombe. They went on to launch Headspace in 2010, first as an events company and later an app with the aim of making meditation more accessible.