He had two older brothers named Eduard (1891–1971) and Ernst (1895–1958) who were both artists as well.
[1] In 1905, Gubler’s father was commissioned to restore the frescoes of the pilgrimage church in Riedertal in the Canton of Uri, and the family spent their annual summer holidays there.
[1] In 1914 Gubler began studying in Kantonsschule Küsnacht teachers’ college to become a primary school teacher, but dropped out in 1918 to work as an independent artist.
In 1956 he did a series of pastel illustrations for Ernest Hemingway's The Old Man and the Sea.
There were exhibitions of his works at the Lehnbachhaus in Munich in 1963 and the Kunstmuseum Bern in 1969.