Immediately after completing his specialization, he was apprenticed to the Architect Ballatore di Rosanna[2] at his firm in Turin.

[citation needed] After a brief period of collaboration with the engineer Bolzon, of Asolo, Ohannés moved to Frassené Agordino, which he had gotten to know as a regular vacation spot since 1922.

There he met the "Axis of Alpinism" Attilio Tissi, Giovanni and Alvise Andrich, and Domenico Rudatis.

In 1935 he collaborated with Ettore Castiglioni to draft the section of a guidebook for the Italian Alps relating to the southern chain of the Pale di San Martino.

[citation needed] At the start of the Second World War Ohannés moved definitively to Asolo despite continuing, for the rest of his life, to retain professional ties in the Agordino valleys.