Staff & Board


Nathan Antonio, Executive Administrator

As Executive Administrator, Nathan oversees HDC’s information management and CRM systems, coordinates activities to ensure information quality and consistent data tracking, leads technology-focused projects to enhance collaboration and organizational impact, and provides critical administrative support to HDC’s staff and Board of Directors. A returned Peace Corps Volunteer, Nathan has worked in non-profit and social services for more than a decade. He was most recently with King County 2-1-1, coordinating operations to augment information and referral services for King County residents experiencing homelessness and with various other housing needs. Nathan brings his skills to HDC to support the efforts of organizations from across sectors working to provide healthy and affordable housing for all. Contact

Dan Cantrell, Operations Manager

As Operations Manager, Dan manages member dues invoicing, oversees technology vendors, works to ensure database integrity and coordination, supports the Executive Director and Finance Committee with financial tracking/reporting and budget development, manages HR and provides staff support for the HDC Charity Federation and several Affinity Groups. Prior to joining HDC, Dan developed an Environmental Health & Safety Management System at a local computer refurbisher and recycler, and previously was executive director at northwest environmental nonprofits. Dan earned a Master of Public Administration degree from the UW’s Evans School of Public Policy & Governance in 2006. Contact 

Marty Kooistra, Executive Director

Marty is recognized for his leadership in community revitalization, poverty alleviation, green building, board development, networks, and strategic alliances domestically and globally. As executive director of HDC, Marty leads our association of diverse organizations in a shared mission to increase access to affordable housing. A first career as founder of a diversified construction business and a subsequent degree in social work allowed Marty to merge his passion for the built environment with his commitment to social justice—and ​led him directly to the affordable housing sector. A past Bush Foundation fellow at the Joint Center for Housing and the Kennedy School of Government at Harvard, Marty co-chairs the University of Washington’s West Coast Poverty Center Housing Roundtable and PSRC’s Regional TOD Advisory Committee and serves on the Growth Management Policy Board,  and serves on the boards of Global Washington and NACEDA. Previous appointments include All Home’s coordinating board and the City of Seattle’s Housing Affordability and Livability Agenda (HALA) committee. Contact

Patience Malaba, Director of Government Relations & Policy

As Director of Government Relations & Policy, Patience brings a decade of experience in community development, policy advocacy and organizing to her work. She leads the process of setting HDC’s annual policy priorities and manages HDC’s advocacy engagement to advance the annual priorities. Prior to joining HDC, Patience managed Seattle for Everyone, a broad coalition of affordable housing developers and advocates, for-profit developers and businesses, labor organizations, environmentalists, and urbanists to advance the first-ever comprehensive package of affordable housing policies in Seattle, known as the Housing Affordability and Livability Agenda (HALA).  Early in her role with Seattle for Everyone, Patience worked with Futurewise, a statewide growth management and civic planning organization, on promoting equitable, environmentally sound housing and land use policies. On behalf of HDC, she serves on boards and committees that include the Puget Sound Regional Council (PSRC)’s Growth Management Policy Board and the Washington Low Income Housing Public Policy Committee. Patience is passionate about working with the HDC membership and association to create a strong united voice for a King County that is affordable, equitable and livable for all. Contact

Emma Scalzo, Communications & Outreach Manager

While a student at Western Washington University, Emma began her work in affordable housing advocacy as chair of the Legislative Affairs Committee. She continued her work at the House of Representatives assisting in non-partisan policy research for both the Housing and Public Safety Committees. Most recently, Emma was the King County Engagement Manager at the Washington Bus, connecting and mobilizing voters on college campuses across the state. In doing so, Emma managed various forms of outreach and communications in order to promote civic engagement and voter turnout among young people. As our Communications & Outreach Manager, Emma works within HDC’s Members Services and Policy Departments. She manages all HDC communication platforms, while promoting efforts and programs both departments. Emma currently serves on Imagine Housing’s Young Professionals Board and as Secretary of the Washington Bus Board. Contact

Loren Tierney, Member Services Director

As Member Services Director, Loren provides overall direction and support for HDC’s member services program, implementing a comprehensive member and business development agenda, and creating impactful programming for our wide array of membership. Prior to joining HDC staff in late June of 2014, Loren worked as Director of the Municipal League of King County and the Municipal League Foundation, and concurrently worked at the philanthropic, member-based Washington Women’s Foundation. Loren is passionate about working with HDC leaders, members, and partners create robust and engaging member programming, and a better connected and efficient affordable housing sector. Loren also currently serves on the board of the WA Housing Alliance Action Fund. Contact

Mallory Van Abbema, Policy & Advocacy Manager

Mallory brings here experience in direct social services, advocacy, and community organizing to her role as Policy & Advocacy Manager at the Housing Development Consortium of Seattle-King County. In this role, she works alongside community partners, HDC members, and the public to support jurisdictions across King County as they work to meet the affordable housing needs of all residents, regardless of household income. Mallory holds a BA & MA in Social Work with a focus on Administration & Policy Practice from the University of Washington. Contact.

2021 HDC Board of Directors

Executive Officers:

President: Brian Lloyd, Beacon Development Group

Vice President: Chris Jowell, Catholic Housing Services

Secretary: Elizabeth Rinehart, WALSH Construction

Treasurer: Mark Gropper, Renton Housing Authority


Derrick Belgarde, Chief Seattle Club

Sai Chaleunphonh, Marpac Construction

Terry Galiney, Seattle Housing Authority

Joel Ing, Edge Developers

Grace Kim, Schemata Workshop

Dan Landes, King County Housing Authority

Alisa Luber, Mercy Housing Northwest

Sunaree Marshall, King County Housing, Homelessness & Community Development

Lindsay Masters, ARCH

Michelle Morlan, Lotus Development Partners

Andrea Sato, Kantor Taylor

Darryl Smith, HomeSight

Kate Smith, SMR Architects

Stephanie Velasco, Seattle Office of Housing

Maiko Winkler-Chin, SCIDpda

Rich Zwicker, Washington State Housing Finance Commission

Katie Randall, Plymouth Housing (Board Fellow 2021)