From 1999 to 2001, Stubb was a researcher in Finland's representation in the European Union in Brussels, and a member of the Finnish government's delegation to the intergovernmental negotiations for the Treaty of Nice.
1999年到2001年，斯图布成为驻布鲁塞尔欧盟的芬兰代表团的一名特别研究员，同时还是参与《尼斯条约》谈判的芬兰政府代表团成员。