Dr. Raphael Kellman is a respected author and board-certified physician. A graduate of Albert Einstein School of Medicine, he has worked as a cancer researcher for Sloan Kettering Memorial Hospital. During the past two decades, Dr. Kellman has treated more than 40,000 patients, developing a global reputation for investigating the root causes of disease and pioneering the use of functional and microbiome medicine. As a doctor trained in internal medicine, Dr. Kellman uses the latest drugs and technology to treat his patients. His helps patients with specific, complex illnesses, as well as those with myriad symptoms and no clear diagnosis. His patient-centered, holistic practice focuses on the complex interaction of each patient’s systems—not only on the disease, but on the entire individual, who is greater than the sum of his or her parts. Informed by his background in the philosophy of science, Dr. Kellman’s treatments are administered with compassion and kindness. He draws on the latest research to address patients’ biochemistry, metabolism, hormones, genetics, environment, emotions, and life circumstances to help them achieve optimal health. In addition to providing patient care and managing a thriving medical practice, Dr. Kellman publishes and lectures all over the world, advocating for whole-patient care and discussing his cutting-edge approach to curing illness through healing the microbiome. Dr. Kellman lives with his wife and two young daughters—his greatest inspiration for revolutionizing healthcare—in New York City.