Matthew Walker is a British scientist and professor of neuroscience and psychology at the University of California, Berkeley, where he has taught since 2007. He is a prominent sleep scientist and public sleep advocate, known for his research on the impact of sleep on human health. Walker is the author of 'Why We Sleep: Unlocking the Power of Sleep and Dreams' (2017), which became a Sunday Times and New York Times bestseller. He also hosts 'The Matt Walker Podcast'.