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, tracks grant compliance and provides staff support for the HDC Charity Federation and several Affinity Groups. Prior to joining HDC, Dan was the Environmental Compliance Lead 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 Affairs in 2006. Contact 

Leah Haberman, Communications and Outreach Manager

As Outreach Manager, Leah combines her passion for connecting with people and creating impactful content to engage with members and further HDC’s policy endeavors through both online and in person outreach. She is the excited voice elevating the amazing collaborative work on affordable housing being done by HDC and its hardworking members by crafting an intentional communication strategy on a variety of platforms. A recent graduate of UW where she studied Law, Societies, and Justice, Leah has worked in advocacy, event planning, social media, and lobbying on a variety of social justice issues. She looks forward to seeing the progress that can be made to ensure access to affordable housing throughout King County. Contact.

Marty Kooistra, Executive Director

A champion of place-based strategies for community revitalization in the US and abroad for 27 years, Marty is recognized for progressive work in the areas of sustainable building practices, homebuyer financial readiness, community development, the rehabilitation and preservation of foreclosed and distressed properties, as well as board development and strategic alliances. A first career as founder and CEO of a successful diversified construction business, and a subsequent degree in social work, allowed him to merge his passion for the built environment with his commitment to social justice, and led him directly to the affordable housing sector.

Before coming to Seattle in 2008 to lead Habitat for Humanity Seattle/South King County, Marty held several leadership positions with Habitat for Humanity’s international headquarters (HFHI). He then served as Board President of HDC before being appointed as Executive Director in 2013. A past Bush Foundation fellow at the Joint Center for Housing and the Kennedy School of Government at Harvard, Marty currently co-chairs the University of Washington’s West Coast Poverty Center Housing Roundtable and serves on the boards of Global Washington, Emerald Cities Seattle, HomeAid Puget Sound, 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, Advocacy Mobilization Manager

As Advocacy Mobilization Manager, Patience Malaba brings a decade of experience in community development, organizing, and policy advocacy to her work. She manages HDC’s policy advocacy engagement and mobilization efforts that advance HDC’s annual policy priorities. Prior to joining HDC, Patience led the outreach work of Seattle for Everyone, a broad coalition of organizations united on a foundation of support for Housing Affordability and Livability Agenda (HALA). She had previously worked as Lead Organizer at SEIU Local 6; having joined the SEIU6 in the final phase of the fight for $15 campaign. Patience is excited to be working with the HDC membership and association to create a strong united voice for equitable housing and a King County that is welcoming to everyone. 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 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


2018 HDC Board of Directors

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

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

Mark Ellerbrook
, King County Housing & Community Development
Amy Besunder, Bellwether Housing

Sean Heron, Plymouth Housing Group
Joel Ing, Edge Developers
Douglas Ito, SMR Architects
Grace Kim, Schemata Workshop

Michelle Morlan, Lotus Development Partners LLC
Miriam Roskin, Seattle Office of Housing
Kristin Pula, HomeSight
Rob Van Tassell, Catholic Housing Services
Kira Zylstra, All Home
Obinna Amobi, Mercy Housing Northwest, 2018 Board Fellow