The 2003 European Summer Meeting of the Association for Symbolic Logic was held in Helsinki, Finland, August 14–20, 2003. The meeting was called Logic Colloquium 2003 and it took place in the Main Building of the University of Helsinki. It was attended by 224 participants and 27 accompanying persons from 32 different countries. The organizing body was the Department of Mathematics of the University of Helsinki. Financial support was provided by the the European Commission, Association for Symbolic Logic, the Academy of Finland, the Finnish Cultural Foundation, the Finnish Academy of Science and Letters, the Rolf Nevanlinna-Institute Research Foundation, and Nokia.

The Organizing Committee consisted of Åsa Ekman, Aapo Halko, Alex Hellsten, Taneli Huuskonen, Juliette Kennedy, Juha Kontinen, Kerkko Luosto, Maria Luosto, Hannu Niemistö, Juha Oikkonen, Matti Pauna, Juha Ruokolainen, Jouko Väänänen (Chair), and Meeri Viljanen, all from the University of Helsinki.

The Program Committee consisted of Peter Aczel (Manchester), Zofia Adamowicz (Warsaw), John Baldwin (Chicago), Elizabeth Bouscaren (Paris), Michael Detlefsen (Notre Dame), Moti Gitik (Tel Aviv), Lauri Hella (Tampere), Thomas Jech (Prague), Rohit Parikh (Brooklyn), Helmut Schwichtenberg (Munich), Ted Slaman (Berkeley), Viggo Stoltenberg-Hansen (Chair, Uppsala), and Jouko Väänänen (Helsinki).

The program of the meeting is listed on the following pages. Not all invited speakers submitted a paper to the proceedings. One invited plenary speaker could not attend and her talk was replaced by a plenary talk by Ludomir Newelski. Steve Jackson was not able to give his lecture but provided his paper for the proceedings. The submissions were all refereed and the editors are indebted to the referees for their work.