Rebecca Williams, PharmD, MPH, is Acting Director, ClinicalTrials.gov at the National Library of Medicine, National Institutes of Health. She moved into this role after serving as the Assistant Director for over a decade. She is responsible for technical, scientific, policy, regulatory and outreach activities related to the operation of ClinicalTrials.gov, an international registry and results database of clinical research. Her research interests relate to improving the quality of reporting of clinical research. Her prior experience was in the area of prescription drug advertising and promotion at FDA and then as a consultant. She received her Pharm.D. from the University of Wisconsin-Madison and MPH from Johns Hopkins University.