Keller-Sutter lived her childhood in Wil before moving to Neuchâtel. She studied language interpretation at Dolmetscherschule Zürich. She then worked in a private capacity while studying political science in London and Montréal. She also achieved a pedagogy post-grad from Fribourg university and worked as a professor in a professional school.
Keller-Sutter undertook a political career as a municipal councilor between 1992 and 2000. She presided the municipal assembly in 1997.
From 1996 to 2000, she was a deputy of the Kantonsrat, while presiding the local arm of the FDP.
On 12 March 2000, Keller-Sutter was elected to the Regierungsrat of the canton of St. Gallen, where she was appointed to the department for security and justice. She was also vice-president of the conference of cantonal directors for justice and police. She presided the government in 2006-2007.
- « La conseillère d'État saint-galloise Karin Keller-Sutter candidate à la succession de Hans-Rudolf Merz », tsrinfo.ch, 19 août 2010
- International Students' Committee, Board of Trustees, received 2 February 2012.
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