Sönke Maatsch is a researcher at the Institute of Shipping Economics and Logistics, Bremen, Germany. He studied economics and political science at the University of Bremen, the New School for Social Research, New York, and the Lille University of Science and Technology. He holds a PhD in Economics and a bachelor's degree in political science. He has participated in numerous research projects on European integration including the EU-funded project 'Reconstituting Democracy in Europe', and has taught at the University of Bremen.

• Introduction Who Migrates? Theory, Lessons from the Past, and the Latest Data Are Welfare States Endangered by Migration? The perspective of economic theory A Model of EU Eastward Enlargement EU Social Legislation and National Social Policies Latest Data: What do we know about the 'New Migration'? National Social Policies in the Light of the Eastern Enlargement Conclusions

Sönke Maatsch is a researcher at the Institute of Shipping Economics and Logistics, Bremen, Germany. He studied economics and political science at the University of Bremen, the New School for Social Research, New York, and the Lille University of Science and Technology. He holds a PhD in Economics and a bachelor's degree in political science. He has participated in numerous research projects on European integration including the EU-funded project 'Reconstituting Democracy in Europe', and has taught at the University of Bremen.

• Introduction Who Migrates? Theory, Lessons from the Past, and the Latest Data Are Welfare States Endangered by Migration? The perspective of economic theory A Model of EU Eastward Enlargement EU Social Legislation and National Social Policies Latest Data: What do we know about the 'New Migration'? National Social Policies in the Light of the Eastern Enlargement Conclusions

Sönke Maatsch is a researcher at the Institute of Shipping Economics and Logistics, Bremen, Germany. He studied economics and political science at the University of Bremen, the New School for Social Research, New York, and the Lille University of Science and Technology. He holds a PhD in Economics and a bachelor's degree in political science. He has participated in numerous research projects on European integration including the EU-funded project 'Reconstituting Democracy in Europe', and has taught at the University of Bremen.

• Introduction Who Migrates? Theory, Lessons from the Past, and the Latest Data Are Welfare States Endangered by Migration? The perspective of economic theory A Model of EU Eastward Enlargement EU Social Legislation and National Social Policies Latest Data: What do we know about the 'New Migration'? National Social Policies in the Light of the Eastern Enlargement Conclusions