Mariane Leite

Executive Assistant to the President and CEO, and Business Manager


Mariane Leite, the Executive Assistant to the President and CEO Joseph Grieboski, and Business Manager for Grieboski Global Strategies, is an experienced Congressional staffer, Government Relations Fellow, Assistant, and Social Coordinator. Born and raised in São Paulo, Brazil, Mariane brings a unique perspective to international consulting and development. Her multi-cultural background enables her to understand and analyze foreign policy from both U.S. and international viewpoints.

She received her Bachelor of Arts in Global Affairs with a concentration in Global Governance, and minors in Latin American Studies and Conflict Analysis and Resolution at George Mason University. She also holds a Comprehensive Fundraising certificate from the Leadership Institute. During her undergraduate career, Mariane was involved with many organizations, including Rotaract Club and Invisible Children. She led Catholic Campus Ministry’s Social Events Committee from 2013 to 2015, and also, took part of other areas of the organization. Currently, she is part of the George Mason University’s Latino Alumni Association.

With 10 years of experience in administrative work, Mariane has held positions as Administrative Assistant and Accounting Assistant in Brazil, prior to moving to the United States. In 2012, she started work in politics under Rep. Lee Terry (R-Neb.), at the United States Congress. Later, she joined Joseph Grieboski at Just Consulting where she gained further policy and foreign relations experience. After her time at Just Consulting, she worked as the Account Executive Assistant at The Leigh Agency, a marketing company, where she further developed branding, advertisement, client-relations, and social media skills. Mariane briefly worked under the Dean at The Catholic University of America’s School of Philosophy, before accepting her current position at Grieboski Global Strategies.

Mariane returns to contribute her academic and professional knowledge in the areas of government relations, conflict analysis and resolution, and Latin America. As Executive Assistant and Business Manager, she is at the forefront of building relationships with clients while ensuring the firm’s objective are fulfilled on a day-to-day basis.