He attended secondary school in Bludenz, and then studied medicine at the University of Innsbruck from 1958, where he received a doctorate in 1965.
He specialised in pediatric and adolescent medicine and was considered a pioneer of the field in Liechtenstein.
[1] He retired in 2019 and his practice subsequently closed due to no successor being found.
[1] In 2002, he was awarded the title of princely medical councillor by Hans-Adam II.
[3] Walch married Christa Licht on 7 February 1969 and they had three children together, but they got divorced at an unspecified time.