Dr Williams served most recently at GRAIL as program lead and lead medical director for the Circulating Cell-Free Genome Atlas (CCGA) program, the largest ever prospective survey of circulating nucleic acids in cancer and a key to the future development of blood-based early cancer detection products. Prior to that, he held oncology drug development positions of increasing responsibility, serving as head of the early development oncology group and then as clinical research medical director in hematology/oncology global development at Amgen, as well as senior medical director in the clinical research & development group at Puma Biotechnology. Dr Williams received both his B.Med.Sc. (with Distinction) and his PhD from the Department of Pathology at the University of Queensland, Australia. He received his Bachelor of Medicine, Bachelor of Surgery (with Honors) from the Faculty of Medicine at the University of Queensland, which is equivalent to an MD degree.