IIASA is proud to announce that 12 researchers from across various IIASA programs have been named on the annual Highly Cited Researchers™ list from Clarivate.

The annual list identifies around 6,600 researchers from across the globe who demonstrated significant influence in their chosen field or fields through the publication of multiple highly cited papers produced over an 11-year period from January 2010 to December 2020, which is quite an elite group considering the number of research institutions and researchers around the world.

The methodology that determines the “who’s who” of influential researchers draws on the data and analysis performed by bibliometric experts and data scientists at the Institute for Scientific Information™ at Clarivate. Their names are drawn from the publications that rank in the top 1% by citations for field and publication year in the Web of Science™ citation index. It also uses the tallies to identify the countries and research institutions where these citation elite are based.

The following IIASA researchers were selected for their exceptional influence and performance in the Essential Science Indicator (ESI)™ fields of environment and ecology research, cross-field research, geosciences, and social sciences: 

  • Oliver Fricko, Integrated Assessment and Climate Change and Sustainable Service Systems Research Groups of the Energy, Climate, and Environment Program
  • Shinichiro Fujimori, Transformative Institutional and Social Solutions, Integrated Assessment and Climate Change, and Sustainable Service Systems Research Groups of the Energy, Climate, and Environment Program
  • Petr Havlik, Integrated Biosphere Futures Research Group of the Biodiversity and Natural Resources Program
  • Zbigniew Klimont, Pollution Management Research Group of the Energy, Climate, and Environment Program
  • Volker Krey, Integrated Assessment and Climate Change Research Group of the Energy, Climate, and Environment Program
  • Michael Obersteiner, Exploratory Modeling of Human-natural Systems Research Group of the Advancing Systems Analysis Program
  • Keywan Riahi, Energy, Climate, and Environment Program
  • Joeri Rogelj, Integrated Assessment and Climate Change and Transformative Institutional and Social Solutions Research Groups of the Energy, Climate, and Environment Program
  • Hugo Valin, Integrated Biosphere Futures Research Group of the Biodiversity and Natural Resources Program
  • Yoshihide Wada, Biodiversity and Natural Resources Program

IIASA Energy, Climate, and Environment Program Director Keywan Riahi is one of only 23 researchers recognized for showing exceptionally broad performance being highly cited in three or more fields. Riahi was recognized in the fields of environment and ecology research, geosciences, and social sciences. Integrated Biosphere Futures Research Group Leader, Petr Havlik, was recognized in both the environment and ecology research, and social sciences fields.

Two researchers not primarily associated with IIASA, but who nevertheless have strong ties to the institute also made the list: 

  • Klaus Hubacek, an alumnus of the former IIASA Water Program
  • Andreas Richter, an alumnus of the former IIASA Ecosystems Services and Management Program

“It is increasingly important for nations and institutions to recognize and support the exceptional researchers who are driving the expansion of the world’s knowledge. This list identifies and celebrates exceptional individual researchers who are having a significant impact on the research community as evidenced by the rate at which their work is being cited by their peers. The research they have contributed is fueling the innovation, sustainability, health, and security that is key for our society’s future,” said David Pendlebury, senior citation analyst at the Institute for Scientific Information at Clarivate.

“The presence of so many IIASA researchers on this prestigious list reflects the high quality, highly relevant, and innovative research undertaken by our researchers. A recognition of this nature should undoubtedly be celebrated. However, it also places a great responsibility on our researchers to continue to systematically, and in a scientifically robust manner, unravel the complexity of the global challenges we face today, so as to facilitate the evaluation of alternative development pathways for their societal relevance and sustainability impacts,” concludes IIASA Deputy Director General for Science, Leena Srivastava.

Congratulations to all these IIASA researchers for this exceptional achievement!

The full 2021 Highly Cited Researchers list and executive summary can be found online here.

News

 Using data analytics to inform and create efficient and sustainable solutions for global change and public health

16 June 2026

Peking University and IIASA advance plans for a new Centre on Global Change and Health

On 28 May, Peking University (PKU) and IIASA held a joint online seminar to discuss health research under global change and to review the progress, priorities, and coordination arrangements for a proposed Centre on Global Change and Health.
IIASA Director General Hans Joachim (John) Schellnhuber with the team at the office of the UN Resident Coordinator for Barbados and the Eastern Caribbean,

12 June 2026

The physics of good vibrations: IIASA and Barbados explore a new model for resilient and thriving societies

IIASA Director General Hans Joachim (John) Schellnhuber visited Barbados at the end of May to deepen engagement with government, academic, diplomatic, and international partners and explore new opportunities for collaboration on resilience, innovation, and sustainable development for Small Island Developing States (SIDS).
Panoramic view of the Academy of Athens in Greece

05 June 2026

IIASA welcomes Greece as its newest member

IIASA is excited to announce that Greece has joined the Institute effective from 1 June 2026 through the Academy of Athens, Greece’s national academy and the highest research establishment in the country.