Mark Motonaga
Managing Partner
Architectural Design
Education
Master in Regional Planning
University of Pennsylvania
Graduate School of Fine Arts
Bachelor of Architecture
University of Southern California School of Architecture
As Managing Partner, Mark Motonaga provides leadership across RIOS’ entire interdisciplinary practice, guiding the firm’s overall strategy, growth, and long-term direction. He strengthens connections across disciplines, encouraging collaboration and advancing a shared vision for the collective’s continued evolution.
He leads RIOS’ master planning and architecture practice with an integrated approach to buildings, landscapes, and the public realm. Across every scale of work, he considers the human experience in tactile, experiential, and cultural ways. He believes design should inspire a sense of wonder, from the smallest detail to the most defining formal move, creating distinctive environments that evolve with meaning and depth.
Mark brings a systems-level perspective to district-scale redevelopment, mixed-use communities, buildings, campuses, and cultural destinations. He guides teams in balancing ambitious design with the practical needs of clients and the people who will experience a place. He is attuned to how design can invite people in, encourage connection, and create the conditions for places to thrive. He understands that places become safer and more vibrant when they feel welcoming and encourage participation.
His work reflects RIOS’ belief that architecture and landscape are inseparable. Together, they can strengthen identity, create connection, and make places more memorable and resilient. He is a consistent advocate for mass timber and sustainable construction, advancing lower-carbon building strategies while creating warm, adaptable environments that strengthen the relationship between people and place.
Mark was named to the Los Angeles Business Journal’s 2026 LA500 list, recognizing influential leaders shaping Los Angeles through transformative design and inclusive leadership. He holds a Master of Regional Planning from the University of Pennsylvania and a Bachelor of Architecture from the University of Southern California.