Ludo Waltman is professor of Quantitative Science Studies and scientific director at the Centre for Science and Technology Studies (CWTS) at Leiden University. He is a coordinator of the Information & Openness focal area and a member of the Evaluation & Culture focal area. Ludo is co-chair of the Research on Research Institute (RoRI).
Ludo’s work focuses on studying and developing infrastructures, algorithms, and tools to support research assessment, science policy, and scholarly communication. Ludo is open science ambassador of Leiden University, member of the board of ASAPbio, chair of the advisory board of OpenCitations, and coordinator of the Initiative for Open Abstracts (I4OA). Together with his colleague Nees Jan van Eck, Ludo has developed the well-known VOSviewer software for bibliometric visualization. Ludo is coordinator of the CWTS Leiden Ranking, a bibliometric ranking of major universities worldwide. In addition, Ludo served as Founding Editor-in-Chief of the journal Quantitative Science Studies.