Centre for Science and Technology Studies Centre for Science and Technology Studies 2333AL Leiden Zuid Holland 31715273909


CWTS is an interdisciplinary institute at Leiden University. Its research staff come from a broad and diverse spectrum of specialized academic fields ranging from psychology, political science, literature studies and information science to computer science, economics, physics and chemistry.

Research retreat 2019, de Volksabdij
Research retreat 2019, de Volksabdij

Share this page

Academic Staff

Anestis Amanatidis

Junior researcher. Anestis employs Techno-Anthropological methods and perspectives to investigate the complex relations between science and society.

Zeynep Anli

Researcher, working mainly on Leiden Ranking and various European Union projects.

Jackie Ashkin

PhD candidate and researcher with FluidKnowledge. Her research examines the relationship between evaluation practices and knowledge production in marine science through an ethnographic lens.

Juan Pablo Bascur Cifuentes

PhD candidate and member of the QSS research group. His research focuses on machine learning and natural language processing of papers to improve literature searches.

Rinze Benedictus

Part-time PhD candidate who also works as staff advisor at the UMC Utrecht and is involved in the Science in Transition initiative. He analyzes institutional policy-making processes that shape research evaluation practices.

Sarah Rose Bieszczad

PhD candidate in the Science and Evaluation Studies (SES) group as part of the Sarah de Rijcke’s Fluid Knowledge Project. 

Carole de Bordes

Researcher and bibliometric consultant. Carole joined CWTS in 2018 and is currently involved in several performance and evaluation studies for independent contract research at CWTS B.V.

André Brasil

PhD candidate also affiliated with the Brazilian Agency for Support and Evaluation of Graduate Education - CAPES. His research focuses on the improvement of the evaluation system adopted by his agency to guarantee the quality and development of Science & Technology in the country. 

Clara Calero-Medina

Senior researcher and coordinator of contract research projects. Clara's research work is related with network analysis applied to scientific publications, particularly citations and co-authorship networks for the study of research performance.

Rodrigo Costas

Senior researcher. Rodrigo's research focuses on the development of new social media metrics (altmetrics), new scientometric applications at the individual-level and the study of funding acknowledgements.

Alex Damianos

Researcher with Fluid Knowledge. His research concerns how policy discourses and ocean science inform each other, analysing translation processes between science and science policy. 

Leonie van Drooge

Senior project manager. Her main activity is contract research and consultancy dedicated to evaluation, strategic organisation and governance of research. She uses qualitative and mixed methods. 

Jonathan Dudek

Junior researcher. Jonathan is working in the research line of 'altmetrics', studying online science communication and new data sources for altmetrics.

Nees Jan van Eck

Senior researcher and head of ICT. Nees Jan's research focuses on the development of visualization tools and algorithms, mainly for analyzing the structure and development of science.

Soohong Eum

Soohong Eum is a PhD candidate. His research interests are governance of public R&D system, and the relationship between organizational structure and innovation. 

Zhichao Fang

PhD candidate. Zhichao’s research interests focus on the development and application of altmetrics and usage metrics.

Thomas Franssen

Senior researcher. Thomas works on the intersection of valuation studies, sociology and STS. Previous research analyzed the constitutive effects of the rise of competitive project funding on the epistemic and organizational properties of research. His current interests are the history of scientometrics and valuation cultures in the humanities and its effects on knowledge production.

Dan Gibson

Researcher focusing on the identification and analysis of academic and research organisations for the Leiden Ranking database.

Gaston Heimeriks

Research fellow at CWTS. His research addresses evolutionary knowledge dynamics to understand how geographic regions, economic sectors and scientific fields create new ideas. 

Laurens Hessels

Professor by special appointment at CWTS. Laurens conducts research into the processes and mechanisms of knowledge valorization and into methods and indicators for evaluating valorization.

Tjitske Holtrop

Researcher. Trained as an anthropologist Tjitske studies how evaluation gets done, what kind of resources and people they mobilize, and what kinds of practices, collectives and ideas of accountability, change and quality they make possible.

Lisette Jong

Researcher. In the Transforming Excellence project Lisette explores how different notions of ‘excellence’ figure in research funding organizations.

Wolfgang Kaltenbrunner

Senior researcher. Wolfgang focuses on a variety of topics in the area of evaluation studies, including the politics of quantification and the interpretation and use of academic CVs in peer review.

Wouter van de Klippe

Part time junior researcher. Wouter has an interest in working to ensure that science and technology are developed in ways that reflect the needs of broader society. He will be working part time on the SUPER MoRRI project while spending the rest of his week volunteering and working at organizations championing social justice issues.

Kwun Hang (Adrian) Lai

PhD candidate of the Quantitative Science Studies research group at the Centre for Science and Technology Studies (CWTS)

Wout Lamers

PhD candidate also affiliated with the Leiden Centre of Data Science. Wout’s research focuses on studying patterns in scientific knowledge accumulation using full-text analysis of publications.

Thed van Leeuwen

Senior researcher and co-leading the research theme on open scholarship. Thed's research focuses on the various aspects of open scholarship, as well as on the research assessment of scholarly activity in the social sciences, the humanities, and law. He is co-editor of the OUP journal Research Evaluation.

Ingeborg Meijer

Senior researcher in research policy and evaluation with a focus on biomedicine and healthcare R&I. Ingeborg’s main goal is to make sure that society is able to use research.

Sonia Mena Jara

Researcher at CWTS. Sonia has a background in Environmental science and is currently involved in European projects building open platforms on data relevant for research, innovation dynamics and policies. She studies structure, scientific impact and collaboration of Non-University Research organizations.

Ed Noyons

Senior researcher and Deputy Director of CWTS for Projects. Ed's main research interests involve structures and mappings of science and their use in science policy and research management, field delineation, and  multi-dimensional impact analysis, in particular societal impact of science.

Ton van Raan

Emeritus professor of Quantitative Studies of Science. Ton's research focuses on the application of bibliometric indicators in research evaluation, science as a self-organizing complex system, statistics of bibliometric indicators, ranking and benchmarking of universities, and mapping of science.

Ismael Rafols

Ismael Rafols is a senior researcher at CWTS. He works on the development of novel approaches to S&T indicators for informing evaluation, foresight and research strategies. His current focus is on research priority setting, in particular for societal challenges such as Sustainable Development Goals (SDGs) in health and agriculture.

Andrea Reyes Elizondo

Researcher. Andrea’s research focusses on the different academic and health science systems and the relationships between them. She is also involved in projects concerning research integrity in scientific publishing and research support organisations.

Sarah de Rijcke

Professor of Science and Evaluation Studies and director of CWTS, and coordinator of the Science and Evaluation Studies research group. Her research interests include academic valuation and evaluation processes, changing research cultures, knowledge infrastructures, and roles of research in and for society.

Alex Rushforth

Alex Rushforth is a researcher at CWTS. He works in the social studies of science, specializing in research evaluation, uses of indicators and research assessment reforms. 

Marta Sienkiewicz

PhD candidate and member of the Science and Evaluation Studies (SES) research group. She studies new tools used in research evaluation, particularly those which aim to capture wider notions of research quality, excellence and impact.

Clifford Tatum

Researcher and member of the Science and Evaluation Studies (SES) working group. Clifford’s research is focused on Open Science in relation to emerging evaluation practices and research information systems.

Robert Tijssen

Emeritus professor of Science & Innovation Studies. Coordinator of the Science, Technology and Innovation Studies (STIS) research group at CWTS. Robert's research interests focus on knowledge flows, linkages, and interactions between science and innovation, with an emphasis on the role of universities.

Vincent Traag

Senior researcher and bibliometric consultant. Vincent's research focuses on complex networks and social dynamics. He holds a Master in sociology and a PhD in applied mathematics, and tries to combine the two in his work.

Joviles Trevisol

Postdoctoral researcher. Joviles is a Brazilian professor. He has a background in Sociology. He is currently studying higher education policies, more specifically, postgraduate assessment policies. His postdoctoral project is a comparative study on postgraduate self-assessment policies in Brazil and the Netherlands.

Judit Varga

Researcher with the FluidKnowledge project. Her research examines how combining methods from science and technology studies (STS) with scientometrics can help study the relationship between (e)valuation and knowledge production in Ocean Science.

Martijn Visser

Researcher and PhD candidate. Martijn's research focuses on data sources for the measurement of research performance.

Ludo Waltman

Professor of Quantitative Science Studies and deputy director of CWTS. Ludo leads the Quantitative Science Studies (QSS) research group. He is coordinator of the CWTS Leiden Ranking and co-developer of the VOSviewer software for bibliometric visualization.

Inge van der Weijden

Senior researcher, lecturer and PhD coordinator. Inge conducts both qualitative and quantitative research on the motivation, selection and evaluation of scholars in order to better understand career development of scientists within and outside academia.

Tim Willemse

Researcher with a background in Innovation Studies. Tim holds a MSc in Innovation Sciences and a BSc in Science and Innovation Management. 

Jos Winnink

Senior researcher. Jos is a member of the Science, Technology, and Innovation Studies research group (STIS). His research focuses on knowledge flows in the interface between science and technology. He has a special interest in the proliferation of discoveries in frontier science (breakthroughs) into game-changing technologies.

Paul Wouters

Professor of Scientometrics and Dean of the Faculty of Social and Behavioural Sciences. Paul is interested in how evaluation systems have developed and are creating new constraints for the development of knowledge. He is also interested in the history of science in general and the role of information systems in these histories in particular.

Qianqian Xie

PhD candidate at the Centre for Science and Technology Studies (CWTS) of Leiden University in the Netherlands. Her PhD research focuses on how research addresses social problems, especially in health.

Alfredo Yegros

Senior researcher and member of the Science, Technology, and Innovation Studies (STIS) research group. Alfredo's research interests include, among others, public-private interactions and knowledge flows, science-technology linkages, and relationship between science/technology and innovation.

Jochem Zuijderwijk

PhD candidate. Jochem is working on a PhD thesis that focuses on the formative effects of new incentive and reward systems in biomedicine within the Science and Evaluation Studies (SES) group.



Visiting Academic Staff

Cornelis van Bochove

Emeritus professor of Science Policy Studies. Cornelis focuses on the impact of various types of research and development activities on economic growth and on the career system in research.

Tung Tung Chan

Visiting Researcher. Tung Tung’s research focuses on Research Intelligence, Responsible Research and Innovation (RRI) and Open Science.

Giovanni Colavizza

Visiting researcher focusing on full-text analytics and the humanities. Giovanni is interested in computational approaches to model the use scholars make of language, in science within Wikipedia, and in understanding the social and intellectual organisation of humanities disciplines.

Eleonora Dagiene

External PhD candidate. Eleonora is working on a PhD thesis that focuses on the quantitative research evaluation and its unintended consequences within the Quantitative Science Studies (QSS) research group.

Peter van Dongen

Visiting researcher at the STIS group.With a background in intellectual property, engineering and technology transfer, Peter’s research interest focusses on factors which drive scientists to come forward with innovations in their disciplines, and how their innovations create societal impact.

Jamal El Ouahi

External PhD candidate. Jamal’s research interests include quantitative science studies as well as research evaluation with a focus on the Middle-East and Africa region.

Márcia Ferreira Gonçalves

Visiting researcher: Márcia is interested in evolutionary innovations, networks and complex systems, combining statistical physics and economics in order to understand the conditions underlying creativity and innovation processes in science.

Javad Hayatdavoudi

External PhD candidate. Javad is working on a PhD thesis that focuses on national research assessment and funding policies from a scientometric-constructivist perspective.

Dmitrii Kochetkov

External PhD candidate. Dmitrii’s PhD topic is 'A Scientometric Study of the Global Excellence Initiatives'. His research interests include scientometrics, knowledge economy, higher education research, and innovation policies.

Vincent Larivière

Associate professor at Université de Montréal and visiting professor at CWTS. At Université de Montréal, Vincent holds the Canada Research Chair on the Transformations of Scholarly Communication.

Marc Luwel

Visiting researcher. Marc's research focuses on performance-based funding in higher education and measuring outcome and impact of publicly funded research.

Noortje Marres

Associate professor at the Centre for Interdisciplinary Methodologies at Warwick University and Visiting Professor at CWTS. Noortje's work is concerned with participation in technological societies and contributes to the development of digital research methodologies, in particular issue mapping.

Philippe Mongeon

Postdoctoral researcher and member of the Science and Evaluation Studies research group. Philippe’s research interests include the relationship between evaluation practices and knowledge production, team science, and researchers’ data sharing and reuse behavior.

Tina Nane

Visiting researcher. Tina's research focuses on the statistical analysis and modeling of bibliometric data and citation networks.

Ton Nederhof

Visiting researcher. Ton's research focuses on research evaluation and bibliometric analysis in general (including in the social sciences and humanities).

Ivo de Nooijer

External PhD candidate. Ivo is working on a PhD thesis that investigates factors which influence the success or failure of licensing negotiations between universities and companies within the Science Technology and Innovation Studies (STIS) research program.

Susana Oliveira Henriques

External PhD candidate. Susana is working on a PhD thesis that focuses on innovation in scholarly communication and peer review, with a special focus on dissemination and quality control of biomedical research. 

Philip Purnell

External PhD Candidate working on regional differences in research and publication behaviour.

Narmin Rzayeva

External PhD candidate. Narmin is working on a PhD thesis that focuses on systematic research of peer review process in scientific journals and covers methods of harmonization of existing peer review models and development of alternatives.

Alexander Schniedermann

External PhD candidate. Alexander Schniedermann works on standardization in biomedical research.

Niki Vermeulen

Visiting researcher, focusing on science and innovation policy and the organisation of research, with an emphasis on scientific collaboration.

Cathelijn Waaijer

Visiting researcher. Cathelijn’s research focuses on science education and study performance in medical school.

Leo Waaijers

Visiting researcher. Leo will work on building a sustainable future for QOAM (Quality Open Access Market) and contribute to the development of a common infrastructure for a variety of initiatives in the field of journal policies and practices.

Jian Wang

Assistant Professor at the Science Based Business Program, Faculty of Science, Leiden University.  

Zohreh Zahedi

Visiting researcher and member of Quantitative Science Studies research group. Zohreh’s research focuses on studying the interactions between social media and science (Social Media Study of Science)



Technical Staff

Bram van den Boomen

Database developer and administrator. Bram is involved in the development and maintenance of the CWTS database system.

Patrick Kooij

Database developer and administrator. Patrick is involved in the development and maintenance of the CWTS database system.

Henri de Winter

Web developer. Henri has over 10 years of experience developing web applications with the Microsoft .NET framework. His current work focuses on frontend developing with JavaScript (e.g. Ext JS, JQuery) and backend developing with the ASP.NET MVC framework.



Marketing & Sales Staff

Mark Neijssel

Sales director CWTS B.V. Mark is responsible for the development of the contract research activities for research performance studies, network analyses, and science mapping studies, as well as tailor-made training courses for clients.



Administrative Staff

Karin den Dulk


Hungwah Lam

Board Secretary of CWTS. His main role is to advise and support the Board of the CWTS in policy, strategic, and organisational matters.

Liesbeth Schaap


Petra van der Weel

Management assistant at CWTS. Petra is also the secretary of the Ethics Review Committee Social Sciences of FSW.


Build on Applepie CMS by Waltman Development