Eckhart Tolle is a German-born spiritual teacher and author, best known for his books, including The Power of Now and A New Earth. He emphasizes the importance of living in the present moment and encourages individuals to transcend their ego-based consciousness to achieve inner peace and fulfillment. Tolle's teachings draw from various spiritual traditions, including Buddhism and Christianity, and focus on mindfulness and self-awareness. He gained widespread recognition after his work was featured on Oprah Winfrey's television show, which helped popularize his ideas and reach a global audience.