Staff & Board


Nathan Antonio, Administrative Coordinator

As Administrative Coordinator, 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 is excited to bring 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 

Aselefech Evans, Equity and Programs Manager 

As Equity and Programs Manager, Aselefech provides critical support to the Member Services Director and Department, to ensure the highest possible delivery of member programming and services for the organization. Prior to joining HDC, Aselefech provided training, facilitation, and assessment services to build the internal and external capacity of health care, human services, and public health professionals both locally and nationally.  That work helped institutionalize their racial equity efforts and compliance, while using best practices based on data and evidence. Aselefech is glad to bring her passion for equity, racial and economic justice to support HDC staff and member organizations

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 an association of 180 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.


Patience Malaba, Policy Manager

As Policy Manager, Patience Malaba 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 excited to be 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.


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 in partnership with HDC’s Program Advisory Group. 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 excited to be working with HDC leaders, members, and friends to create a continuously robust and engaged member program. Please feel free to contact Loren with program ideas, or suggestions regarding membership. Contact

Mallory Van Abbema, Policy and Advocacy Manager

Mallory has previously worked in policy advocacy, and direct social service. Her educational background centered on equitable approaches to policy development and implementation. Throughout her work, Mallory has consistently been reminded how central access to safe, affordable homes is to overall wellbeing for individuals, families and communities. Her roles with Statewide Poverty Action Network, and Washington Low Income Housing Alliance introduced her to traditional “grassroots” methods of community organizing which shored up her passion for centering the voices of those most impacted by policy decisions. Mallory joins the team as Advocacy and Policy Manager, and looks forward to expanding on the vital work that HDC delivers. Contact.


2019 HDC Board of Directors

Executive Officers:
President: Andrea Sato, Kantor Taylor PC
Vice-President: Brian Lloyd, Beacon Development Group

Secretary: Mark Gropper, Renton Housing Authority
Jill Fleming, Capitol Hill Housing

Mark Ellerbrook
, King County Housing & Community Development

Joel Ing, Edge Developers
Grace Kim, Schemata Workshop

Michelle Morlan, Lotus Development Partners LLC
Rob Van Tassell, Catholic Housing Services
Kira Zylstra, All Home
Terry Galiney, Seattle Housing Authority
Dan Landes, King County Housing Authority
Maiko Winkler-Chin, Seattle Chinatown International District Public Development Authority
Stephanie Velasco,
Office of Housing
Lindsay Masters, A Regional Coalition for Housing
Anthony Bridgewater, King County 2019 Board Fellow