Our Team

Dr. Eric W. Miller 🇺🇸
Managing Director & Founder 

Eric founded Marsh Creek Social Works to pursue happiness for all, by connecting people, organizations, and purpose.  Eric is a strategic management expert with over two decades of strategy design, development, and implementation experience in both government and the social sector.

Prior to working with Arabella Advisors as an executive advisor to the CEO/COO, Eric served as the chief strategy architect for the Department of Defense’s efforts to receive US service member remains from North Korea, and as the lead strategic planner for the US intelligence community’s response to both BREXIT and the 2016 presidential nomination briefing process.   

Eric is a certified nonprofit consultant (CNC), and both presents and publishes social sector evidence-based research. Eric is currently serving as the board president for a Virginia-based nonprofit and as a communications advisor for a Canadian nonprofit focused on social economy research.  

Eric is also an adjunct professor at both the George Mason University School of Business and the National Intelligence University, teaching courses on strategy, management, and global business economics.  Eric’s doctoral and post-doctoral studies examined scaling social impact within social enterprises and nonprofit organizations. In addition, Eric earned an MBA, a master’s in strategic intelligence, and a master’s in financial planning.

Bea Masters
Project Director

Beatrice is a strategy and operations consultant with experience in strategy development, market prioritization, and measurement and evaluation. She is passionate about solving strategic, analytical, and operational challenges for mission-driven organizations.

Beatrice worked at Canback Consulting, a division of the Economist Group, for four years. While at Canback, she worked on pricing strategy for a Chinese fast-food company, global nutrition demand forecasting for a global snack corporation, and city prioritization for a South African retail company, among other projects. She has a global mindset with a focus on emerging markets and has worked on-site with clients in a variety of international settings, including China, South Africa, and Mexico. Prior to Canback, Beatrice worked for Bridge International Academies, an international group that creates and runs primary schools in underserved areas.

Beatrice lives in the Boston area, where she organizes with SURJ Boston, the local chapter of Showing Up for Racial Justice, a national network of groups organizing white people for racial justice. Beatrice holds a B.A. in Economics from Harvard University. 

Gabriel Leggieri
Program Associate

Gabriel recently graduated from the University of Virginia with a degree in Environmental 

Sciences. While at school, he volunteered at environmental conservation organizations, including the Charlottesville Area Tree Stewards and the Rivanna Conservation Alliance.

He also spent time at Morven Farms, a student-run kitchen garden where employed organic agricultural practices and examined the challenges of running a Community Supported Agriculture program. In his previous hometown of Manassas, Virginia, he volunteered with the Prince William County Food Hotline and Food Bank to help those experiencing food insecurity. Gabriel currently resides in Upstate New York with his family where he volunteers with the Old-Growth Forest Network. 

Dr. Laura D’Antonio
Research Associate

Laura D’Antonio is a teaching assistant professor of International Business at the George Washington University School of Business. Laura teaches courses in management in developing countries, globalization, and global strategy.  Her teaching focusses on understanding the international business context and includes a strong emphasis on global environmental and social issues. 

Laura’s passion for and commitment towards academic excellence has resulted in numerous teaching awards, including the 2018 Outstanding Contributions to Teaching award at GMU where she was also a Dean’s Faculty Fellow. Laura has also made several pedagogical conference presentations focusing on active learning in both the online and face-to-face environments. She was a contributing author to and managing editor of Solutions: Business Problem Solving and presented a co-authored paper at the ASEM conference on E-Leadership.

Prior to her time in the academe, Laura enjoyed a successful banking career with a focus on commercial banking, private banking, and mortgage and construction lending, reaching regional vice president levels at Wells Fargo and Citigroup. Laura earned her BA from Yale University, her MBA from NYU’s Stern School of Business, and her Doctor of Management degree from the University of Maryland University College. Her doctoral research focused on trust development in virtual teams.

Heidi Sumser
Strategy Associate

Heidi has over 15 years´ experience at the intersection of international development and climate finance, having worked in micro, small and medium-sized enterprise (MSME) banking, green finance and impact investing with mission-driven, private sector companies focused on emerging markets. She is a specialist in sustainability, small-business banking, and developing, managing, and growing new, strategic business initiatives. She is a skilled relationship manager and partnership developer with an extensive international network and the ability to engage stakeholders across sectors.  

Heidi worked as Green Lending Officer at responsAbility Investments, a Swiss leader in impact investing, managing a clean energy debt portfolio of financial institutions in Latin America for the Global Climate Partnership Fund (GCPF). Prior, she worked for the German ProCredit Holding based in Bolivia at Banco Los Andes ProCredit where she worked in the business and credit risk departments and then led the creation and implementation of sustainability, including green finance, as a new, strategic area. She also brings experience in development finance consulting and the non-profit sector.

Heidi is currently a mentor to sustainable start-ups at Bethesda Green´s Innovation Lab, a participant in a competitive global learning program for circular economy with the Ellen MacArthur Foundation and a guest lecturer on circular economy at universities in the United States and Peru. She earned a master´s degree in Development Economics and International Business Relations from the Fletcher School at Tufts University a bachelor´s degree in International Relations from Johns Hopkins University.

Craig Nazareth 🇺🇸
Strategy Associate

Craig has over two decades of experience in strategy and program implementation for US government and Department of Defense capability development.  Craig is a seasoned advisor for senior executives regarding strategies for strengthening organizational capabilities and collaboration, including working internationally between the United Nations, NATO, and the Korean peninsula.  

Craig is a faculty member at the University of Arizona, serving as the Program Director and Professor of Practice for the College of Applied Sciences Intelligence and Information Operations Program.

Craig is a passionate supporter of community and social services, currently volunteering his time and energies towards homeless outreach programs in Sierra Vista and Tucson.  He is working with several organizations to meet critical needs in the ongoing struggles during the COVID-19 pandemic.  

Craig earned a master’s in strategic intelligence from the National Intelligence University and resides in Sierra Vista with his wife and two children.

Katherine Lorenz
Senior Advisor for Philanthropy

Katherine Lorenz is President of the Cynthia and George Mitchell Foundation (www.cgmf.org), a grantmaking foundation focusing on environmental sustainability in Texas. She is the Leader of the Next Gen of the Giving Pledge, and Forbes named Katherine “Ones to Watch,” an up-and-coming face in philanthropy in 2012. Previously, she served as Deputy Director for the Institute for Philanthropy (www.instituteforphilanthropy.org), whose mission is to increase effective philanthropy in the UK and internationally. 

Prior to that, Katherine lived in Oaxaca, Mexico for nearly six years where she co-founded Puente a la Salud Comunitaria (www.puentemexico.org), a non-profit organization working to advance food sovereignty in rural Oaxaca through the integration of amaranth into the diet. She continues to be involved with Puente’s work as an active board member. Before founding Puente, she spent two summers living in rural villages in Latin America with the volunteer program Amigos de las Américas and later served on their Program Committee and as a trustee of the Foundation for Amigos de las Americas.

Katherine currently serves on the Boards of Directors of the Environmental Defense Fund, The Philanthropy Workshop (Vice-Chair), and the Endowment for Regional Sustainability Science. Katherine holds a B.A. in Economics and Spanish from Davidson College.

John Hamilton 🇺🇸
Senior Advisor for Military & Veterans Services

John has over four decades of leadership experience and expertise in policy and strategy development and implementation, and resource programming within the Department of Defense.

During his time in government service, he led numerous diverse teams and organizations focused on complex, strategic-level transformational issues, to include the restructuring of major organizations, rebalancing strategic assets based on national-level policy and strategy shifts, and relocation of large organizations during the Congressionally directedBase Realignments. John also has over 20 years’ experience living abroad and working with international partners on defense and humanitarian related issues.

John has a Masters in Human Resource Management and a Masters in International Studies. He attended the Harvard Senior Fellowship Program in 2015.

Dr. Rozlyn Engel
Senior Advisor for Global Economics

Roz is a Distinguished Professor of the Practice at the U.S. Naval Academy, where she teaches courses on economics and foreign policy.

She has held several high-level positions in the U.S. government, including at the U.S. Treasury, the National Intelligence Council, and the U.S. Department of Defense.

She grew up in Mountain Lakes, NJ, and raised her own family in Millburn.

🇺🇸 = Veteran