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Our Team

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Dr. Max Roser

Founder and Director

Max is the founder and director of Our World in Data. He began the project in 2011 and for several years was the sole author, until receiving funding for the formation of a team. He is also Programme Director of the Oxford Martin Programme on Global Development at the University of Oxford, and Co-executive Director of Global Change Data Lab, the non-profit organization that publishes and maintains the website and the data tools that make our work possible.

Twitter: @MaxCRoser / Site:

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Dr. Esteban Ortiz-Ospina

Head of Strategy and Operations

Esteban joined us in 2016. He leads strategy and operations at Our World In Data. He is also the executive co-director of Global Change Data Lab, the non-profit organization that publishes and maintains the website and the data tools that make our work possible. Esteban does research on economic development, the public sector, education, and a wide range of related topics. He completed his doctoral studies at the University of Oxford (DPhil Economics). / @eortizospina / Mastodon


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Dr. Hannah Ritchie

Head of Research

Hannah joined us in 2017. She is Head of Research at Our World In Data. 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. / @_HannahRitchie

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Joe Hasell


Joe joined us in 2017. His research focuses on global trends in poverty and economic inequality. He is currently working towards a Ph.D. at the University of Oxford. / @JoeHasell


Dr. Charlie Giattino


Charlie joined us in 2020. His work touches on a number of topics, including health, technology, and more. Charlie completed his Ph.D. in Cognitive Neuroscience at Duke University. / @charliegiattino

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Dr. Bastian Herre


Bastian joined us in 2021 to improve and expand our data and research on democracy and conflict. Bastian has a Ph.D. in Political Science from the University of Chicago and an MA in Political Science and Economics from Heidelberg University. / @bbherre /

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Saloni Dattani

Researcher (Part-time)

Saloni joined us as a researcher in 2021. She has a graduate degree in psychiatric genetics and is working towards a Ph.D. at 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. / @salonium

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Mallika Snyder

Researcher (Part-time)

Mallika joined us in 2022 as a researcher focusing on demography and public health-related topics. She holds an MA degree in Statistics and is working towards a Ph.D. in Demography at UC Berkeley. / @mallika_snyder /


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Edouard Mathieu

Head of Data

Edouard joined us in 2020 as our Head of Data, to oversee the whole chain of collection, transformation, documentation, and dissemination of our data. He previously worked as a data scientist at the University of Oxford, in the departments of Population Health, and Primary Care Health Sciences. He holds a master’s degree from Sciences Po Paris.

edouard [at] ourworldindata [dot] org / @redouad

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Dr. Pablo Rosado

Senior 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. /

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Dr. Bobbie Macdonald

Senior Data Scientist (Part-time)

Bobbie joined us in 2020 to contribute to our data management team. He has a Ph.D. in political science from Stanford University and an MSc in international development from the London School of Economics. / @bnjmacdonald

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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). / @lucasrodesg

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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). / @f_spooner

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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. / @parriagadap


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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. / @larsyencken

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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. / @danyx23

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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.

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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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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.


Marcel Gerber

Software Engineer (Part-time)

Marcel joined us in 2020. Alongside his computer science studies, he is helping us build and improve our data visualization tools and the website as a whole.

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

Product and Design

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Dr. Matthew Conlen

Head of Product and Design

Matthew joined in 2022 to help with data visualization and digital publishing efforts. He has a Ph.D. in computer science from the University of Washington and has worked on data journalism efforts at various publications including the New York Times, CNN, and FiveThirtyEight. Matthew lives in Seattle, Washington. / @mathisonian /


Marwa Boukarim


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. /

Operations and Finance

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Valerie Rogers Muigai

Operations and Finance Manager

Valerie joined us in 2021 as Operations and Finance Manager. She has over a decade of experience in international development and social enterprise in East Africa and is the founder of Kijani Uganda. She has an MBA from Oxford Saïd Business School.

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Natalie Reynolds-Garcia

Operations and Administration Officer

Natalie joined us in August 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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Natasha Ahuja

Executive Assistant to Dr. Max Roser

Natasha joined us in 2022. She works closely with Max on prioritizing his areas of work, productivity, internal and external communication, and his writing. She also supports the operations team as needed. Natasha holds an MPP with a focus on international development from Georgetown University. / @nat_ahuja


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Jason Crawford

Software Team Lead (Part-time Advisor)

Jason Crawford is the former CEO and co-founder of Fieldbook and has been an engineering manager at companies including Amazon and Flexport. He is the author of The Roots of Progress, where he writes about the history of technology and industry. / @jasoncrawford

Former team members

A list of our former team members and contributors can be found here.