Ludo Waltman

Ludo Waltman serves as Scientific Director and Professor of Quantitative Science Studies at the Centre for Science and Technology Studies (CWTS) within Leiden University's Faculty of Social and Behavioural Sciences. He holds multiple influential positions including Co-chair of the Research on Research Institute (RoRI), President of ASAPbio, and Editor-in-Chief of MetaROR (MetaResearch Open Review). As an Open Science Ambassador for Leiden University, he actively promotes transparency and innovation in scholarly communication.

Waltman's research spans Quantitative Science Studies, Bibliometrics, and Metascience, with particular focus on university rankings, preprint ecosystems, open access publishing models, and research evaluation frameworks. His work critically examines the infrastructure of scholarly communication, advocating for more transparent and efficient systems that better serve the research community. He has been instrumental in developing initiatives like the Barcelona Declaration on Open Research Information and advancing publish-then-review models as alternatives to traditional peer review.

His recent publications reveal a consistent emphasis on systemic issues in scholarly communication, with particular attention to preprint adoption across Europe, the relationship between assessment reform and publishing reform, and the methodological transparency of university rankings. These works collectively demonstrate his commitment to evidence-based approaches for improving research infrastructure and evaluation practices.

Waltman actively engages in advising and shaping research policy through his leadership roles. As Co-chair of RoRI, he helps guide metascience research that examines the research system itself. His work with MetaROR promotes innovative peer review models, while his presidency at ASAPbio advances preprint culture in life sciences. He frequently collaborates with major research funders, publishers, and infrastructure organizations to implement practical reforms in scholarly communication.

Through CWTS at Leiden University, Waltman leads a research environment focused on quantitative analysis of science and technology systems. His work connects with broader initiatives like the Research on Research Institute and the Barcelona Declaration movement, creating networks that bridge researchers, funders, and infrastructure providers committed to improving research practices.