Our Team

(Listed in alphabetical order)

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Tuna Acisu

Junior Data Scientist

Tuna joined us in 2024. She previously worked on machine learning for epigenetic data and in management consulting. She has an M.Sc. in Data Science from the Technical University of Munich.

tuna@ourworldindata.org / @antea04

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Pablo Arriagada

Data Scientist

Pablo joined in 2022 to expand the OWID database on data related to poverty, inequality, and economic development. Before this, he was a consultant in data analysis, data visualization, and data science for academic and journalistic research in Chile, and previously worked in institutional data analysis for higher education. He has an MPA in Public and Economic Policy from the London School of Economics.

pablo.arriagada@ourworldindata.org / @parriagadap

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Daniel Bachler

Principal Software Engineer

Daniel joined us in 2021. Previously he worked on scientific data management and visualization solutions in the life sciences. He studied film directing and now focuses on applying both his engineering and creative background on improving our visualization tools.

daniel.bachler@ourworldindata.org / @danyx23 / danielbachler.de

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Matthieu Bergel

Senior Software Engineer

Matthieu joined in 2019 and has the overall mission of providing readers with a flowing experience between data and research throughout the publication. Drawing on his consulting experience from communication agencies in Paris, he is now building the next iteration of our content management system.



Marwa Boukarim

Lead Visual Designer

Marwa joined us in 2022 as a freelance UX/UI designer. She is helping refine, define and document a consistent design system for the OWID website. Previously, she worked on designing end-to-end digital experiences for clients in the public sector, telco, and entertainment industries at Frog Milan.

marwa@ourworldindata.org / marwaboukarim.com


Dr. Saloni Dattani


Saloni joined us as a researcher in 2021. She has a Ph.D. in psychiatric genetics from the University of Hong Kong and King’s College London. She is working with us as a researcher on health-related topics, including mental health.

saloni@ourworldindata.org / @salonium

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Antoinette Finnegan

HR Manager

Antoinette joined us in 2023 as our Human Resources (HR) Manager. She most recently worked in HR for a biotech spinout, and also has experience in fundraising and marketing.



Marcel Gerber

Full Stack Engineer

Marcel joined us in 2020. He is helping us build and improve our data visualization tools and the website as a whole. Marcel holds a master’s degree in computer science from RWTH Aachen University.

marcel [at] ourworldindata [dot] org / @MarcelGerber9


Dr. Charlie Giattino

Research & operations specialist

Charlie joined us in 2020. His research has touched on a number of topics, including technology and health. He completed his Ph.D. in cognitive neuroscience at Duke University.

charlie@ourworldindata.org / @charliegiattino


Joe Hasell

Head of Product and Design

Joe joined us in 2017. He works across teams to develop tools and layouts that make research and data more accessible and understandable. He also contributes as a researcher, where his work focuses on global trends in poverty and economic inequality. He is currently working towards a Ph.D. at the University of Oxford.

joe@ourworldindata.org / @JoeHasell


Dr. Bastian Herre


Bastian joined us in 2021. He works on human rights, democracy, armed conflict, and violence. He has a Ph.D. in Political Science from the University of Chicago and an MA in Political Science and Economics from Heidelberg University.

bastian@ourworldindata.org / @bbherre / bastianherre.com


Dr. Bobbie Macdonald

Senior Data Scientist

Bobbie joined us in 2020 to contribute to our data management team. In 2023, he joined the Product and Design team, working on Analytics. He has a Ph.D. in political science from Stanford University and an MSc in international development from the London School of Economics.

bobbie@ourworldindata.org / @bnjmacdonald

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Edouard Mathieu

Head of Data and Research

Edouard joined us in 2020 as our Head of Data, before becoming Head of Data and Research in 2023. He manages the team of data scientists and researchers who produce our articles and data visualizations. He previously worked as a data scientist at the University of Oxford, in the Population Health and Primary Care Health Sciences departments. He holds a master’s degree from Sciences Po Paris.


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Sophia Mersmann

Senior Data Visualization Engineer

Sophia joined us in 2023 to focus on our in-house visualization library, Grapher. Previously, she worked as Data Visualization Engineer in the newsroom as part of a data journalism team at rbb|24 in Berlin. Sophia lives in Frankfurt.

sophia@ourworldindata.org / @sophiamersmann

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Matt Munday

Communications and Outreach Strategy Lead

Matt joined us in 2024 to enhance the visibility and reach of our research and our data. He has an extensive communications background, including roles at LSE, the Royal Institute of British Architects, and the BBC.



Dr. Esteban Ortiz-Ospina

Executive Co-Director

Esteban is the Executive Co-Director of Our World in Data alongside Max Roser. In tandem, they lead Global Change Data Lab, the non-profit organization responsible for publishing Our World in Data. Esteban is also an Honorary Researcher at the Oxford Martin Programme on Global Development, where his research and writing cover topics including economic development, public sector analysis, education, and a wide range of related issues. He completed his doctoral studies at the University of Oxford (DPhil Economics).

esteban@ourworldindata.org / @eortizospina / Mastodon

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Martin Račák

Senior Full Stack Engineer

Martin joined in 2024 to focus on improving our site and content management system. He studied computer science and previously worked in forecasting, telecommunications, and built websites for various clients.


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Natalie Reynolds-Garcia

Operations and Administration Officer

Natalie joined us in 2022 as Operations and Administration Officer. Her background is in research administration and education, having taught Spanish, French and English. She was previously the administrator for the Rees Centre at the University at Oxford.


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Dr. Hannah Ritchie

Deputy Editor and Science Outreach Lead

Hannah joined us in 2017. She became Deputy Editor and Science Outreach Lead at Our World In Data in 2023. She was previously Head of Research. She focuses on the long-term development of food supply, agriculture, energy, and environment, and their compatibility with global development. Hannah completed her Ph.D. in GeoSciences at the University of Edinburgh.

hannah@ourworldindata.org / @_HannahRitchie

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Lucas Rodés-Guirao

Senior Data Scientist

Lucas joined us in 2021. He previously worked as a Deep Learning Researcher at the National Institute of Informatics (Tokyo, Japan) and as a Data Scientist for the private sector. He studied an M.Sc. in Electrical Engineering at UPC (Barcelona, Spain) and KTH (Stockholm, Sweden).

lucas@ourworldindata.org / lcsrg.me

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Valerie Rogers Muigai

Senior Finance and Operations Manager

Valerie joined us in 2021 after more than a decade of working in international development and social enterprise in East Africa. She has an MBA from Oxford Saïd Business School and an Advanced Diploma in Management Accounting from the Chartered Institute of Management Accountants.



Dr. Pablo Rosado

Principal Data Scientist

Pablo joined in 2022. He has a Ph.D. in Astrophysics and Data Analysis from the Max Planck Society in Germany. After doing postdoctoral research in Australia, he started working in Data Science for the private sector. He has been a technical mentor for Data Science for Social Good and has worked in finance and renewable energy companies, as well as the intellectual property office of the European Union.

pablo@ourworldindata.org / pablorosado.com

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Professor Max Roser

Founder and Executive Co-Director

Max is the founder of Our World in Data and began working on this free online publication in 2011. Today, he serves as the publication’s editor and leads the team as its co-director. He is the Professor of Practice in Global Data Analytics at the University of Oxford’s Blavatnik School of Government, the Programme Director of the Oxford Martin Programme on Global Development, and Executive Co-Director of Global Change Data Lab, the non-profit organization that publishes Our World in Data.

Twitter: @MaxCRoser / Site: MaxRoser.com

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Dr. Veronika Samborska

Data Scientist

Veronika joined us in 2023. She recently finished her Ph.D. in Computational Neuroscience at the University of Oxford, and previously worked in the Data Journalism team at the Financial Times.


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Ike Saunders

Full Stack Engineer

Ike joined us in 2022. He’s a web developer originally from Aotearoa New Zealand, now based in Montreal, and if he’s not tinkering with our website’s codebase, he’s probably drumming or watering his plants.


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Dr. Fiona Spooner

Senior Data Scientist

Fiona joined us in 2021. She was previously a Turing postdoctoral fellow at the University of Exeter working on tracking the Sustainable Development Goals and modeling the Covid-19 pandemic. She has a Ph.D. in Ecology and Environment from UCL (London, UK) and an MSc in Conservation Science from Imperial College (London, UK).

fiona@ourworldindata.org / @f_spooner


Mojmir Vinkler

Data Engineer

Mojmir joined us in 2022 as a data engineer. He studied statistics and computer science, which he applied to various machine learning projects in healthcare, fintech, and travel. Now he’s trying to improve our data infrastructure to improve the lives of our data analysts.


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Angela Wenham

Executive Assistant to Prof. Max Roser

Angela joined us in 2024 as Max Roser’s executive assistant. Her background is in Project Management and she holds an MSc in Psychology from Oxford Brookes University.



Dr. Lars Yencken

Head of Engineering

Lars joined us in 2021 to lead our engineering team and help us evolve our data visualization and our overall site. He previously led tech and data teams in consumer health at Grace Health and Lifesum in Stockholm and holds a Ph.D. in Computational Linguistics from the University of Melbourne.

lars@ourworldindata.org / @larsyencken


Dr hassan masum

Dr. Hassan Masum

Strategy and Development Advisor

Hassan has worked in diverse sectors including data leadership, global health, health R&D, collaborative technologies, foresight, research, and engineering. He has a Ph.D. in Computer Science.

Former team members

Here is a list of our former team members and contributors.