Our team
Many hands, working together as one.
Staff
4 Directors
10 Registered architects
6 3D Modelers
3 Interns
5 Administratives
30 Coworkers in total
9 LEED Accredited Professionals / Green Associates
2 EDGE Experts
Carlos Ossenbach
Our founding partner and current vice-president of OPB Arquitectos is an architect with great prestige in the area of profession. After studying in Aachen, Germany and graduating with a degree in Engineering and a Masters in Architecture, he founded the company in 1977, with the idea of leading an architectural firm that would be part of the constant development in technology and design, without neglecting sustainability.
Today, thanks to his vision and work, OPB has collaborated with transnational firms such as Siemens, Metalco, Intel and Boston Scientific.
Sebastian Klus
Sebastian Klus today is a key player in our firm. He became partner in 2013 and was promoted to director of operations in 2024.
Born in Essen, Germany, he earned his Bachelor of Engineering and Master of Architecture with emphasis in project management at the Technical University of Dortmund. He joined OPB Architects in 2004 and in 2009 was promoted to Director of Production. He was accredited LEED AP BD + C from the US Green Building Council in 2009. Sebastian recently obtained his MBA, with a specialization in management, from the University of Costa Rica.
Javier Chaves
Javier has been with us since 2006 and became Design Manager in 2009. Four years later he became an associate of OPB.
He studied Architecture at the University of Costa Rica and since 2009 he is a LEED AP BD+C accredited professional by the Green Building Certification Institute.
Marco Castro
Marco's day-to-day responsibilities include large projects. He earned his degree from the University of Costa Rica, and started working at OPB Arquitectos in 2006. He was quickly promoted to Assistant Design Manager and in 2014 to Production Manager, becoming a partner at OPB in 2015. During his nine years with our firm, he has been involved in projects such as the Walmart Escazú, Pacífico Resort, Iribó and Yorkín schools and the new buildings and laboratories of the Engineering department of the University of Costa Rica. In 2010 he received his certification as a LEED AP B + C professional from the US Green Building Council; in 2015 he was certified in EDGE design.