He founded the Stiftung gegen Rassismus und Antisemitismus ("foundation against racism and antisemitism") (GRA) in the 1980s.
In the 1990s, he was instrumental in the development of the Swiss anti-racism legislation (1995), and involved as a moderating voice of reason in the debate surrounding the role of Switzerland during the World Wars in the context of the World Jewish Congress lawsuit against Swiss Banks.
He received several decorations, including an honorary doctorate of the University of Zürich,[1] in 1998.
Sigi Feigel was buried in Zürich's Israelitischer Friedhof Oberer Friesenberg.
[2] In 2006, the city of Zürich named a terrasse at the Sihl river after him, the "Sigi-Feigel-Terrasse" (47°22′33″N 8°32′07″E / 47.3759°N 8.5352°E / 47.3759; 8.5352).