Aubrey Marcus is an American author, entrepreneur, and podcaster known for his work in the fields of health, wellness, and personal development. He is the founder and former CEO of Onnit, a lifestyle brand that focuses on fitness supplements, nutritious foods, and fitness equipment designed to help individuals achieve their peak performance. Marcus has also gained recognition for his book "Own the Day, Own Your Life," which offers readers a comprehensive approach to optimizing every aspect of their personal and professional lives. Through his podcast, "The Aubrey Marcus Podcast," he explores a variety of topics with a wide range of guests, including health and fitness experts, psychologists, and spiritual leaders. Marcus is also known for his interest in spirituality and self-exploration, which are recurring themes in his teachings and writings.