Dean Ornish is a clinical professor at UCSF and founder of the Preventive Medicine Research Institute. He's a leading expert on fighting illness -- particularly heart disease with dietary and lifestyle changes.
Nic Marks gathers evidence about what makes us happy, and uses it to promote policy that puts the well-being of people and the planet first. He's the founder of the Centre for Well-Being at the UK think tank New Economics Foundation (NEF).
As Director of National Drug Control Policy, Michael Botticelli led the Obama Administration’s drug policy efforts to diminish the consequences of substance use through evidence-based prevention, treatment and recovery support services.