Denis Kierans is a Research Affiliate at COMPAS and a visiting academic at the Spanish National Research Council’s Institute of Economics, Geography and Demography in Madrid.
At COMPAS, he is a part of the 17-partner consortium leading the Measuring Irregular Migration and Related Policies (MIrreM) project, a follow-up to the Clandestino project (2009). In it, he coordinates the collection, assessment and dissemination of estimates of the irregular migrant population across Europe and North America. He is currently co-editing a handbook on the use of irregular migration data in policymaking.
From 2019 to 2024, he was a Senior Researcher at the Migration Observatory and the Global Exchange on Migration at Diversity at COMPAS.
