When Chancellor Angela Merkel assumed her office in November 2005, Corsepius was in charge of economic aspects of European integration and was negotiating the EU's 2007-13 budget.
[3] Subsequently, Corsepius coordinated the German European policy between 2005 and 2011, including the preparations for Germany's presidency of the EU in the first half of 2007 as well as the drafting of the Berlin Declaration.
[4] From February 2011, he served as interim advisor on economic and financial policy and as G8 sherpa to Merkel, following his predecessor Jens Weidmann's move to become president of the Deutsche Bundesbank.
In a 2015 reshuffle, Meyer-Landrut was made German Ambassador to France and Corsepius resumed his position as chief advisor on European affairs to Chancellor Merkel.
In 2015, news media reported that Corsepius was included in a Russian blacklist of prominent people from the European Union who are not allowed to enter the country.