Ohna is an architecture Studio founded in 2011 by Antonio Viejo Moriano, with offices in Santander and Madrid and international work experience.

The studio is focused on the design and development of passive buildings in multiple scales and programs (residential, cultural, educational, rehabilitation and offices) and collaborates with other firms specializing in energy efficiency, structural engineering, acoustic conditioning, interior design and landscaping.

Antonio Viejo Moriano is an architect (Universidad Politécnica de Madrid – ETSAM 2000), PhD and PhTP (PassivHaus Institute, Darmstadt, Germany).

Before founding Ohna, he was a professor at the ETSAM and the European University of Madrid and has worked developing projects together with architects of his generation, winning several awards in national and international architectural competitions.