He earned his Matura, the general qualification for university entrance, in 1984 at the Liechtenstein secondary school in Vaduz.

Subsequently, he started studying business administration with an area of expertise in finance and accounting at the University of St. Gallen, where he graduated in 1991.

[1] Hasler worked as head of controlling in the business division Thin Films of Balzers AG.

[2] The 2013 Liechtenstein general election resulted in a win for the Progressive Citizens' Party, and Hasler was appointed prime minister.

[8] Hasler married Gudrun Elkuch (born 5 September 1973), a member of the Krisens Intervention Team in Liechtenstein, on 28 May 2003 and they have two children.