[2] Villiger was best known for his involvement into the Swissair bankruptcy in 2001, when he was among the members of the rescue plan task force, which ultimately failed.

On 15 April 2009, he was elected Chairman of the Board of Swiss banking giant UBS, holding this post until 3 May 2012.

In 1995 Kaspar Villiger apologized on occasion of an official visit by Dan Culler who was an internee in the Wauwilermoos internment camp during World War II.

Dwight Mears, a U.S. Army officer, covered the apology in his 2012 PhD thesis on the American internees in Switzerland.

Kaspar Villiger is a Member of the Global Leadership Foundation, an organization which works to support democratic leadership, prevent and resolve conflict through mediation and promote good governance in the form of democratic institutions, open markets, human rights and the rule of law.