Born in Trieste, as a child he moved to Zurich with his family. He became an excursionist amidst the mountains of Switzerland. In 1921, at the age of twenty-four, Brunner graduated in electronic engineering and that same year he returned to Trieste, where his passion for mountains found new impulse. Brunner went on important climbing excursions, at first along the Alpi Giulie and then across the entire Alps until 1966, when he went on his final climb on the Creta Grauscaria. Brunner’s interest in photography found its natural expression through the representation of Alpine landscapes, which he knew much about and was able to interpret with great poetry.