He attended high school in Feldkirch and from 1976 he studied chemistry at the University of Basel, where he obtained a licentiate in 1980 and later a doctorate in 1994.
From 1986 to 1989 he worked as an engineer and product manager at Balzers AG.
[1] Fellow Landtag members, Herbert Elkuch and Thomas Rehak sided with Hasler and left the party.
[4][5] In this election, the party nominated him as a government candidate on 16 December 2024, being the first time the party has presented government candidates since its formation.
[6] Hasler married Verena Stalder (born 21 May 1953) on 30 June 1984 and they have two children together.