About
Tønnessen is an economist with a Ph.D. in demography from the University of Oslo. Her research fields include immigration and emigration, demographic consequences of migration, as well as regional population development and domestic migration. She has also been a Fulbright student at Princeton University, head of the Norwegian population projections in the research department of Statistics Norway, and a researcher in demography at Stockholm University.
Field of study
Population development Demography Population geography Demography Emigration Population Immigration Etniske relasjoner Work migration International migration Migration and family Demographic change Population projections Migration
Research groups
Research projects
Ongoing research projects
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Emigration from today’s Norway: Who, why, and how does it shape Norwegian society? (EXITNORWAY)
Little is known about those who emigrate from Norway today, why they leave, and how their emigration affects Norwegian society.
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PREMIUM EU
Policy REcommendations to Maximise the beneficial Impact of Unexplored Mobilities in and beyond the European Union
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Small city regions – development, resilience and sustainability (SMACREG)
Norway is among the countries in Europe with the largest share of residents living in smaller city regions (SCRs). These regions are central to the national goals of regionally balanced development and to securing sustainable regions throughout the country.
Completed research projects
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Government responses to high influxes of protection seekers
A comparative analyses of eight European countries' responses in 2015/16 and 2022/23
Publications and research
Scientific publications
Tønnessen, Marianne
; Constant, Amelie; Syse, Astri
(2025).
Who Emigrates From a Wealthy, Peaceful Country? And Who Comes Back? Evidence From Norway.
Population, Space and Place.
Vol. 31.
https://doi.org/10.1002/psp.70048
Skjerpen, Terje;
Tønnessen, Marianne
(2025).
Try another municipality or leave the country? A disaggregated approach to determinants of internal migration and emigration for immigrants and natives in Norway.
The annals of regional science.
Vol. 74.
https://doi.org/10.1007/s00168-025-01362-w
Monti, Andrea;
Tønnessen, Marianne
(2024).
Party penalty or party premium? ‘Party Swedes’ in Norway and their income before, during, and after migration.
Population Studies.
https://doi.org/10.1080/00324728.2024.2409752
Tønnessen, Marianne
; Syse, Astri
(2023).
How much would reduced emigration mitigate ageing in Norway?.
Vienna Yearbook of Population Research.
Vol. 21.
https://doi.org/10.1553/p-g5fe-hafz
Tønnessen, Marianne
(2022).
Arbeidsmigrasjon inn til og ut av Agder.
Meyer, Frank (Ed.).
Arbeid, arbeidere og arbeiderbevegelse på Agder 1500-2020. p. 185-208.
Cappelen Damm Akademisk.
https://doi.org/10.23865/noasp.180
Syse, Astri;
Tønnessen, Marianne
(2022).
Flere eldre innvandrere blant framtidens brukere av omsorgstjenester.
Tidsskrift for omsorgsforskning.
Vol. 8.
https://doi.org/10.18261/tfo.8.2.2
Adsera, Alicia; Andersen, Synøve Nygaard;
Tønnessen, Marianne
(2022).
Does One Municipality Fit All? The Employment of Refugees in Norway Across Municipalities of Different Centrality and Size.
European Journal of Population.
Vol. 38.
https://doi.org/10.1007/s10680-022-09618-3
Tønnessen, Marianne
(2021).
Movers from the city in the first year of Covid.
Nordic Journal of Urban Studies.
Vol. 1.
https://doi.org/10.18261/issn.2703-8866-2021-02-03
Andersen, Synøve Nygaard; Adsera, Alicia;
Tønnessen, Marianne
(2021).
Municipality Characteristics and the Fertility of Refugees in Norway.
Journal of International Migration and Integration.
https://doi.org/10.1007/s12134-021-00840-2
Tønnessen, Marianne
; Mussino, Eleonora; Aradhya, Siddartha
(2021).
How Assad changed population growth in Sweden and Norway: Syrian refugees’ impact on Nordic national and municipal demography.
PLOS ONE.
https://doi.org/10.1371/journal.pone.0244670
