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Graham Teskey, based in Canberra, Australia, is the leader of Abt Global’s Global Governance practice. He serves as a resource on the governance aspects of international development, leads or supports engagement with major clients, and is building Abt’s thought leadership and reputational capital in governance.Before joining Abt, Graham was the principal governance specialist for the Australian Department of Foreign Affairs and Trade (DFAT), where his role was to advise DFAT on its governance and public sector programs in its international aid program.

Ricki Jarmon leads the Data Capture & Surveys practice within the Digital & Data Services team. He has more than 30 years of experience in survey research for U.S. government agencies, including the Department of Labor, Food and Nutrition Service, Department of Housing and Urban Development, Social Security Administration, Centers for Disease Control and Prevention, and Administration for Children and Families.

Dr. Michael Plotzke is a senior health economist with expertise in the area of Medicare payment policy, the organization of healthcare providers and quality measurement. His work typically involves the analysis of large datasets such as Medicare claims, assessment and enrollment data. Dr. Plotzke serves as principal investigator for multiple projects with the Centers for Medicare & Medicaid Services.  On the “Home Health Prospective Payment System and Hospice: Analysis Support and Monitoring” project, Dr. Plotzke leads a team of researchers in analyzing trends in Medicare hospice and home health usage and constructing large-scale payment reform options for both benefits.  Dr. Plotzke also leads the “Evaluation of the Medicare Care Choices Model” project that evaluates a new payment model for end-of-life care that is being tested with 141 hospice providers.  This project involves analysis of existing administrative data and collection of new data through surveys of caregivers, surveys of hospice providers and in-depth case studies of hospice providers participating in the model.

Douglas W. Elmendorf, Ph.D., is Lucius N. Littauer Professor of Public Policy at Harvard University’s John F. Kennedy School of Government. He served as Dean of the Kennedy School from 2016 to 2024 and was previously Director of the Congressional Budget Office from 2009 to 2015.Elmendorf has held senior economic positions with the Federal Reserve Board, the President’s Council of Economic Advisers, and the Treasury Department, where he was Deputy Assistant Secretary for Economic Policy. He is a widely respected economist who has deep knowledge of many of Abt’s core research areas, including health care policy and approaches to increasing economic security.Elmendorf is the author of more than 30 publications and has testified before Congress on economic issues 50 times since 2005. 

Lisa Simeon is Abt Global’s Chief Operations Officer.  In this role, Simeon is establishing a global operations function to cover all aspects of project management. It will include continuous improvement and scalability of Abt’s standards, processes, and digital platforms for project start-up and closeout, workforce planning, risk management, and quality review to achieve strong financial performance and ensure client satisfaction across the company. She will continue to oversee Human Resources and will add responsibility for global security operations and emergency response to her portfolio.

In his career as a senior finance and operations executive, Rehberger most recently served as the Senior Vice President, Chief Financial Officer of Engility, a Virginia-based government contractor.  He held similar positions with TASC from 2010 until its merger with Engility in 2015.  Rehberger helped guide both companies as the government industry cycled through a severe downturn and recovery, counseling the Board of Directors regarding strategy, enterprise risk management, cyber security, and compensation.  He previously held executive positions with telecommunications firms XO Communications and MCI. In 2017, Virginia Business awarded Rehberger the Virginia CFO of the Year award for his outstanding commitment to financial stewardship and dedication to the success of Engility.

Gerald Adolph is an expert in growth strategy, acquisition strategy and merger integration planning for corporate and mission driven organizations. He led the Global Mergers & Restructuring Practice and was elected senior partner over a 35-year career with Booz Allen Hamilton and its successor strategy companies.Adolph was one of the lead practitioners and developers of Booz's very successful capabilities-driven approach to strategy.  During his consulting career he has primarily focused on assisting clients with growth strategies, new business development, innovation strategy and business redefinition. He often works with companies/entities undergoing very significant industry disruption.

John St. Clair has more than 25 years of operations and finance experience, with a focus on global operating models, project excellence, business process improvement and driving transformational change to scale organizational impact. He has a proven record of success leveraging global business and financial acumen with cross-disciplinary expertise to develop and execute strategic business plans, programs, and initiatives across countries and cultures.  St. Clair brings valuable perspectives from his extensive experience driving operational improvements across projects, regions and headquarters teams in the international development field.

Sarah Dunn, an experienced international developme nt leader, is Managing Director of Abt Britain.  She is responsible for driving the UK growth strategy as well as leading and mentoring our UK home office and Program teams to deliver against Abt’s mission. Dunn spent nearly two decades as a senior executive with the Department for International Development (now Foreign, Commonwealth & Development Office), where her final role in 2014 was country director for DFID Southern Africa/South Africa.  While at DFID, she worked across Africa, the Middle East and Caribbean and held several other executive and strategic advisory positions, including head of trade policy.

Michael Dumlao is Vice President of Global Marketing and Communications, overseeing the company’s brand evolution and future marketing vision and strategy. He came to Abt from Booz Allen Hamilton, where he led the Fortune 500 company’s rebrand as their first Director of Brand, served as a Senior Brand and Diversity Advisor for leaders in the Federal Government, and was the longest-serving leader of GLOBE+, their LGBTQ+ business resource group. He oversaw brand strategy, market research, and creative activation.