Danny Kolosta is a housing development project manager. An East Bay native, Danny received a Bachelor of Arts in Geography with a GIS emphasis from UC Santa Barbara before returning to the Bay Area to work in municipal infrastructure mapping and asset management for local government. With a desire to engage with issues at a more granular urban scale, Danny pursued a Master in Urban Planning degree from Harvard University Graduate School of Design, which he received in 2022.

Since 2021, Danny has been project managing new construction and rehabilitation affordable housing developments across the Sacramento and Bay Area regions. He has experience in all stages of the development process from submitting responses to competitive RFPs, site acquisition, financing applications, construction closings, construction administration and closeout, lease up, permanent conversions and beyond. Danny has collaborated with local grassroots community organizations, private developers, investors, lenders, political leaders, and local, regional, and state government agencies.

Spencer Hotelling is an architectural designer from Los Gatos and Santa Cruz, California. He spent his undergraduate years in Houston pursuing a Bachelor of Architecture at Rice University, where he developed a fascination with both monumental and playful architecture, as well as an interest in the integration of our built environment with ecology.

Prior to CO-, Spencer worked at Diller Scofidio + Renfro in New York, where he assisted in the design of a mixed-use high-rise project, as well as constructed full-scale facade mockups and competition models. He also has prior experience with multi-family housing, schematic landscape design, and creating digital marketing materials to build the trust of clients. He believes that the essence of creative work transcends disciplinary boundaries, and the intuitions he has fostered via metalworking, photography, and drawing inform his architectural practice. At CO-, he is committed to realizing housing projects in California that are not only affordable, but also project dignity and vitality.

Everritt Phillips is an architect at Collective Operations (CO-). Originally from the Midwest, he earned a Bachelor of Science in Architecture from the Taubman College of Architecture and Urban Planning at the University of Michigan. After beginning his career in Detroit, he worked on projects ranging from adaptive reuse and healthcare to large-scale corporate campuses, including significant contributions to the General Motors Technical Campus and KLA’s headquarters in Ann Arbor.

Since relocating to California, Everritt has focused on housing while also gaining experience in hospitality and data center design. His broad background shapes a comprehensive role at CO-, where he contributes across all phases of project delivery, from early design through coordination and execution, in support of the firm’s mission to expand access to quality housing. He brings versatility and a forward-looking mindset, with a particular interest in exploring innovative approaches to meet California’s housing needs.

Everritt is a licensed architect in California.

Weijia Song is an architect and real estate developer from Auckland, New Zealand. As a co-founder of Collective Operations (CO-), Weijia serves as President and Director of Development, leading the financing and construction of multi-family affordable housing projects throughout California. Before founding CO-, Weijia was a Senior Project Manager at Eden Housing, one of California’s largest non-profit affordable housing developers. At Eden Housing, she delivered 298 affordable units that serve low-income families, seniors, formerly homeless individuals, and people with intellectual and developmental disabilities. She continues to support affordable housing development through CO- and is spearheading efforts to build and rehabilitate over 4,000 units of affordable housing for CO’s clients.

Prior to founding CO-, Weijia practiced as an Associate Architect and Designer at SHoP Architects in New York and Ricardo Bofill Taller de Arquitectura in Barcelona, after which she worked as a Senior Project Manager for Eden Housing, an affordable housing developer in California. She also previously served as a Lecturer in Real Estate and the Practicum Coordinator at the Harvard Graduate School of Design, where she was integral in launching the school’s new Master of Real Estate (MRE) program. Weijia Song holds a Master of Science in Real Estate Development from MIT and a Bachelor of Architecture from Rice University.

Weijia is a licensed architect in California and New Zealand.

Courtney Stephen brings an interdisciplinary background as an architect and structural engineer to CO-. Originally from Texas, Courtney completed a Bachelor of Science in Civil Engineering, graduating Summa Cum Laude from Texas A&M University, where she also minored in Art and Architectural History. Driven by a passion for innovative and holistic structural solutions, Courtney pursued a Master of Science in Civil Engineering with a Structural Engineering concentration from MIT, where she joined the FEMA Post-Disaster Housing Response Research Team under the Digital Structures research group. She most recently graduated with an M.Arch I degree from Harvard GSD, focusing on adaptive reuse and resilience design.

Courtney’s work has spanned engineering, design, and project management, establishing her cross-disciplinary skillset and collaborative approach to project realization. Courtney has worked on diverse architectural and structural projects, including foundational systems for high-profile buildings like the LA County Museum of Art at Skidmore, Owings & Merrill, and architectural concept development for Tesla’s Gigafactory in Texas. Her experiences include architectural internships with JK-AR in Seoul, where she helped design a timber clinic complex, and HOK in San Francisco, where she contributed to architectural design in sustainable airport construction. She now contributes to the mission of CO- to provide quality housing to California.

Alex Yuen is an architect and urban designer, leading CO-‘s design arm. Hailing from Hong Kong and San Francisco, Yuen received a Bachelor of Architecture from Rice University and a Master of Architecture in Urban Design, with distinction, from the Harvard University Graduate School of Design. His individual design work and involvement in larger urban research projects have been published and exhibited globally. Yuen has received numerous awards, including the Odebrecht Award for Sustainable Development, the William Ward Watkin Fellowship from the Rice School of Architecture, the Award for Excellence in Urban Design, and the Urban Design Thesis Award from the GSD.

Alex is currently a faculty member at the Harvard University Graduate School of Design and has previously taught at the California College of Arts and the University of Virginia, while also having lectured on architecture and urbanism and serving on juries at institutions around the world. Prior to co-founding CO-, he worked at a number of architectural and urban design firms around the US and Asia, including Diller Scofidio + Renfro and the Office for Metropolitan Architecture (OMA).

Alex is a licensed architect in California.