Keith Fifield, PhD in Nuclear Physics from University of Pennsylvania, 1973 has held research positions in nuclear physics laboratories at the universities of Pennsylvania, Oxford, and ANU. In 1986, he began to develop the new technique of accelerator mass spectrometry (AMS) at the ANU’s 14UD Heavy-Ion Accelerator Facility. This became a full-time occupation from 1991. Since then, Keith has been at the forefront of innovation in both the methods and application of the technique. He has published more than 280 refereed papers in the fields of Nuclear Physics and AMS.