After graduating from high school, studied viola in Hamburg, Freiburg and Mannheim, graduating with distinction.
1996 – 2014 Violist in the Bern Symphony Orchestra
1996 First construction of string instruments under the guidance of Michael Stürzenhofecker
2005 federal certificate of proficiency, violin making school Brienz.
Participation in a one-year restoration course with Jean-Jacques Fasnacht, violin making school Brienz.
Since 2005 Establishment of the Krieger violin making atelier in Bern (since 2019 Schutter Widmer Krieger Geigenbau GmbH).
2011 Higher professional examination with master craftsman diploma, violin making school Brienz.
2012 / 2014 / 2018 Co-organiser of the exhibitions on Swiss violin making “Stringsattached”.
since 2019 Co-director and specialist teacher at the Swiss Violin Making School.
Member of the Swiss Violinmakers Association SVGB.
Participation in the last professional reform of the federal certificate of proficiency, violin making