15th BERLIN OPEN ACCESS CONFERENCE was held online on the theme "ADAPT AND ADVANCE" on September 28 – October 01, 2021, was co-Hosted by the University of California and the Max Planck Society’s Open Access 2020 Initiative. In this invited conference, the stakeholders and decision-makers in research and scholarly communication from 46 countries came together to reflect on their progress in transforming the current subscription-based system of scholarly journal publishing to a system based on open dissemination of research results for the benefit of science and society. An executive summary of the 15th Berlin Open Access Conference is now available via the conference main page: https://oa2020.org/b15-conference/   Videos of conference plenaries and posters are also now available through https://oa2020.org/b15-conference/plenaries/  ---------- Dr. J. K. VIJAYAKUMAR, Consultant - Strategic Information Advisor, King Abdullah University of Science & Technology (KAUST). https://www.linkedin.com/in/vijayakumarjk/