Ryohei Mogi | Demographer

Ryohei Mogi

Ph.D. in Demography

Pompeu Fabra University, Department of Political and Social Science (Spain)

I am a demographer who bridge scientific research with real-world action.

My mission is to turn evidence into action to tackle low fertility, through research and collaboration with policymakers, the media, and both public and private sectors.

Background

I received my Ph.D. in Demography from the Centre for Demographic Studies, Universitat Autònoma de Barcelona.
I then worked as a Research Fellow at the Department of Sociology, University of Oxford, and as an Assistant Professor at the Interdisciplinary Centre on Population Dynamics, University of Southern Denmark.
I am currently based at Pompeu Fabra University in Barcelona.

My expertise lies in comparative demographic research, analysing fertility and family change.

How I work with partners

Alongside academic research, I actively engage with policymakers, media, and the public and private sectors.
Here are the main ways I collaborate:

• Advisory & consulting: Supporting policymakers and organisations with evidence-based guidance. This includes survey design, analysis of fertility and marriage trends, and the creation of data dashboards
• Public speaking & lectures: Keynotes, seminars, and talks on fertility and population issues
• Writing & media: Articles, commentary, and fact-checking for newspapers, magazines, and international media outlets

Invited Talks (Selected)

• 06/03/2024. Challenges of dataviz and the reactions from the internet audience to our study. RAS seminar, Office for National Statistics, the UK.

At universities: Universidad Nacional de Educación a Distancia (Spain), Charles University (Czechia), London School of Hygiene and Tropical Medicine, Princeton University, Macquarie University (Australia)

Media Appearances & Interviews (Selected)

• Todo por hacer. Radio 5, rtve. 30/09/2025. (In Spanish)
• What superstition tells us about humanity. Financial Times. 25/09/2025. (In English)
• New mothers are getting older - but in East Jutland there is still a preponderance of teenage mothers. TV2 Østjylland. 05/04/2023. (In Danish)
• Over-45s in Denmark giving birth more than teens. The Copenhagen Post. 04/04/2023. (In English)
• Fertility is now a global challenge - report exposes one important truth. Nyheder TV2. 04/04/2023. (In Danish)
• Two numbers say a lot about how we have children today: Fertility expert calls it both a “triumph and an accident”. Berlingske. 03/04/2023. (In Danish)

My 4 missions as a demographer

Follow me

Blog posts on low fertility and demographic change, written for a broad audience and for policy insights

• Medium
• LinkedIn
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• bluesky