William N. William Jr., MD is a medical oncologist with a specialization in thoracic and head and neck cancers. He earned his medical degree from the University of São Paulo, Brazil, where he also completed his residency in internal medicine. He pursued a fellowship in medical oncology at Hospital Sírio-Libanês in São Paulo, followed by advanced training at the University of Texas MD Anderson Cancer Center, where he completed both a research fellowship and a clinical fellowship focused on thoracic and head and neck malignancies. Dr. William joined the faculty at MD Anderson, where he served for nearly 12 years in the Department of Thoracic/Head and Neck Medical Oncology. His roles included Assistant Professor, Associate Professor, and Co-Chief of the Head and Neck Medical Oncology Section. During his tenure, he led numerous clinical and translational research initiatives in the prevention and treatment of lung and head and neck cancers. His achievements include conducting the first molecularly-guided oral cancer prevention study, leading multiple targeted therapy trials for head and neck cancers, and developing novel targeted and immunotherapy-based strategies for neoadjuvant treatment in these disease areas. 

In 2017, Dr. William returned to Brazil, where he was appointed Director of Medical Oncology and Hematology at Hospital BP in São Paulo. He currently serves as the National Leader for Thoracic Oncology and National Co-Leader for Head and Neck Oncology at Oncoclínicas, the largest oncology care network in South America. Recognized as one of Latin America’s foremost medical oncologists, Dr. William continues his research efforts through the Latin American Cooperative Oncology Group and international collaborations, with a mission to reduce the cancer burden in Brazil, Latin America, and beyond.