City Systems

our mission

Building lasting solutions to systemic challenges within cities.


In the News


8/21/19 - Behavior Change Case Study: City Systems & Affordable Housing

City Systems’ Derek Ouyang was interviewed for the Meeting of the Minds Behavior Change Blog Series, written by Kate O’Brien.


EAST palo alto garage conversions 

We are working with Rebuilding Together Peninsula, EPA CAN DO, Soup, and the City of East Palo Alto to streamline the garage conversion process, with the goal of increasing the number of safe and affordable second units in the community.



south stockton promise zone

We are working with the Reinvent South Stockton Coalition, the San Joaquin County Housing Authority, the San Joaquin Council of Governments, and the City of Stockton Mayor’s Office to envision vibrant and green economic development in South Stockton.


our team

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derek ouyang, CEO and Co-founder

Derek, age 27, graduated from Stanford University in 2013 with dual Bachelor’s in Civil and Environmental Engineering and Architectural Design, and in 2015 with a Master’s in Structural Engineering and Geomechanics. He was project manager of Stanford’s first-ever entry to the U.S. DOE’s 2013 Solar Decathlon and has been featured as an up-and-coming designer in the Los Angeles Times, in Home Energy magazine’s “30 under 30”, at TEDxStanford, and at Stanford+Connects NY and Seattle. He is Co-Founder of City Systems and lecturer in Stanford’s Sustainable Urban Systems Initiative.

rob best, cfo and co-founder

Rob Best has a Ph.D in Sustainable Design and Construction from the Civil and Environmental Engineering department at Stanford University and currently works at Arup. His research focused on network planning, integration, and optimization of urban infrastructure systems. He has a B.S. in Engineering from Harvey Mudd College and an M.S. in Civil and Environmental Engineering from Stanford. He was the Design and Construction Manager for the Stanford Solar Decathlon. Rob was also the Projects and Education Director for Engineers for a Sustainable World, a U.S. based non-profit that advances project-based learning and knowledge-sharing on sustainability and engineering nationwide. He also has experience as a consultant modeling the energy consumption of buildings and urban developments and evaluating the long-term impacts of pollution and hazardous industries.