 From 2003 to 2005 he was vice-president of the Austrian Science Fund (FWF).Because of his intimate knowledge of the Vienna Circle, Sigmund was invited to the Illinois Institute of Technology to speak at the inaugural Remembering Menger event on April 9, 2007.Sigmund's publications include 133 scientific papers, including 18 in "Nature"; 11 edited volumes; 25 essays; and 5 co-authored books.