Publications
No one systematically measures the people who move between countries. Daniel Atz builds the institutions that do it anyway — a book, a 99-country publication, investment-migration data drawn from primary government records, and the diaspora research where the practice began.
Books
Insights into Luxembourgish Dual Citizens in the Americas
A demographic study of the people who have reclaimed Luxembourgish nationality by ancestry across the Americas — who they are, where they live, why they applied, and what they intend to do with a European passport.
The Argument
The keynote from HackTown 2025, in English: what the industrial revolutions, ancestral knowledge and a two-and-a-half-thousand-year-old Confucian phrase have to say about building technology — and artificial intelligence — that people can live with. It is also the method behind everything else on this page.
Three bodies of work
01
American Emigration Revue
No federal agency counts the Americans who leave; there has been no federal census of Americans abroad since 1976. AER — which Daniel founded and edits — is an independent research publication built on the alternative: original reporting, a weekly brief, and a continuously updated dataset spanning 99 countries, assembled by a network of country researchers working in 21 languages, with a Data Transparency Index scoring how openly each country reports its American population.
02
Investment migration
Using Brazil’s Diário Oficial da União, MigranteWeb filings and the CNPJ corporate registry, Daniel tracks the real-world uptake of Brazil’s investor residency pathways — research grounded in a process he completed himself as a startup investor. His analysis of 2025 found that 512 investors chose Brazil that year, and almost none used the most favourable pathway.
03
The Luxembourg diaspora
Daniel’s first research subject was the movement he was part of. Drawing on Luxembourg’s open government data and LuxCitizenship’s anonymized case files, The LuxCitizenship Study mapped the country’s new dual citizens across the Americas over four editions through 2024 — work profiled by the Luxembourg government’s open-data portal and held in the catalogue of the Centre de Documentation sur les Migrations Humaines in Dudelange.
Latest study
512 investors chose Brazil in 2025. Almost none took the best deal. Brazil approved 512 investor residencies in 2025. Almost all took the expensive route, and the cheapest and fastest pathway went almost entirely unused. Built from the Diário Oficial da União, MigranteWeb and the CNPJ corporate registry. BrazilInvestment MigrationData Read the study → Each study opens where it was originally published — the Luxembourg diaspora work at LuxCitizenship, the Brazilian investor-residency data at StartBrazil.
We leverage Luxembourg government data to conduct in-depth analyses of the growth in the Luxembourg Dual National population and migration trends in Luxembourg. This page is updated on an ongoing basis. Which Luxembourg dual citizenship pathways are open in 2026. Citizenship Recovery – Article 89 According to the Ministry of Justice,
LuxembourgUnited StatesData
From the Napoleonic Code to permitting dual nationality: the nationality women lost and regained, and the 2008 and 2017 provisions that let tens of thousands across the Americas become Luxembourgers again.
LuxembourgCitizenshipLaw
As of December 31st, 2023, 27,632 Luxembourg citizens were living in Brazil. Who are these Brazilian-Luxembourgers? Explore this interactive study to find out. Background According to Luxembourg’s statistics agency STATEC, at least 894 Brazilian dual citizens were living in Luxembourg on January 1, 2023. Most obtained citizenship through ancestry. In addition, now over 27,632 Luxembourgish citizens
LuxembourgBrazilCitizenshipData
From 1841-1890, approximately 45,000 Luxembourgers left the Grand Duchy for the United States. Now, over 13,000 of their descendants have obtained dual citizenship in Luxembourg.Who were these Luxembourgers and how did they end up in the United States? We explore. Background Our research study on the American-Luxembourgers is based on 416 dual citizens. This includes LuxCitizenship clients as well as
LuxembourgUnited StatesData
Why are so many Americans applying for Luxembourgish citizenship? This is the first survey to measure how these new dual citizens see Luxembourg and their future in Europe. Background From July 11th to July 26th, 2023, we ran an open survey of American-Luxembourgish dual citizens through ancestry. 416 confirmed dual citizens participated, representing a wide range of
LuxembourgUnited StatesCitizenshipData
Why are so many Brazilians applying for Luxembourgish citizenship? This is the first survey to measure how these new dual citizens see Luxembourg and their future in Europe. Background From July 11th to July 26th, 2023, we ran an open survey of Brazilian-Luxembourgish dual citizens through ancestry. 634 Brazilian dual citizens participated, representing a wide range of
LuxembourgBrazilCitizenshipData
Why are Argentines applying for Luxembourgish citizenship? This is the first survey to measure how these new dual citizens see Luxembourg and their future in Europe. Background In April and July of 2023, we ran an open survey of Argentine-Luxembourgish dual citizens through ancestry. 124 dual citizens participated representing a wide range of ages and demographics. The
ArgentinaLuxembourgCitizenshipData
As of December 31st, 2024, 541 Luxembourgish citizens were living in Argentina. Who are these Argentine-Luxembourgers? Explore this interactive study to find out. Background Since 2018, LuxCitizenship has been producing interactive case studies on the new Luxembourgish dual citizens. After LuxCitizenship’s trip to Argentina to meet with the Argentine-Luxembourger 🇱🇺🇦🇷 community in April 2023, we were driven to expand
LuxembourgCitizenshipData
As of December 31st, 2023, 14,972 Luxembourgish citizens were living in the United States, about 13,000 of which are dual citizens through ancestry. Who are these American-Luxembourgers? Explore this interactive study to find out. Background First launched in 2018, the American-Luxembourgers Study is a project aimed at demystifying the new citizens of Luxembourg through ancestry.
LuxembourgUnited StatesCitizenshipData
The Data, Out Loud
Two recordings of the research being used in public: a webinar on how Luxembourgers abroad actually vote, and the first visit by Luxembourgish members of parliament to their Brazilian dual citizens — a community the data surfaced before anyone had gone to see it.
Papers
Method
Everything above rests on verifiable primary sources — official gazettes, national statistical offices, population registries — supplemented where relevant by practitioner data, anonymized and reported in aggregate. For data questions, collaboration or media use of the figures, get in touch.
