In 2008, Reynoso was active in former Sen. Hillary Clinton's campaign for the presidency before joining the campaign of then Sen. Barack Obama. Prior to joining the Obama administration, Reynoso was an attorney in private practice at the international law firm of Simpson Thacher & Bartlett LLP in New York. Reynoso resided in the Washington Heights neighborhood in Manhattan and served on the boards of several non-profit groups. She also served as a legal fellow at Columbia Law School and the Institute for Policy Integrity at NYU School of Law. In 2006, Reynoso served as deputy director of the Office of Accountability at the New York City Department of Education. Reynoso has published widely in both Spanish and English on a range of issues including regulatory reform, community organizing, housing reform, immigration policy and Latin American politics for both popular press and academic journals. In 2009, Reynoso joined former Secretary of State Hillary Clinton to serve as Deputy Assistant Secretary in the Bureau of Western Hemisphere Affairs. During her tenure, Reynoso was charged with developing and implementing a comprehensive security and Rule of Law strategy for Central America and the Caribbean. In October 2011, President Barack Obama expressed his intention to nominate Reynoso as United States Ambassador to the Oriental Republic of Uruguay, a nomination that required the advice and consent of the United States Senate. On March 30, 2012, the U.S. Senate confirmed Reynoso as United States Ambassador to Uruguay. As an ambassador, Reynoso focused on trade and commerce, with particular interest in agricultural trade, and on science, technology and education cooperation. Reynoso is a member of the Council of Foreign Relations and a World Economic Forum Young Global Leader. Reynoso is the recipient of various public interest awards, including recognitions from Columbia University, New York University, the North Star Fund, the Legal Aid Society and the Hispanic National Bar Foundation. She serves on the boards of several nonprofit and advocacy organizations. She is also a member of a Washington D.C.-based Western Hemisphere think tank, the Inter-American Dialogue.
Recognition
Reynoso was recognized in Crain's New York's 2017 "List of Leading Women Lawyers in NYC". She and her colleague Nicole Silver were recognized in Latinvex's 2017 ranking of "Latin America's Top 100 Female Lawyers." In 2017, Winston & Strawn was ranked as an international firm for its Latin America practice, of which Reynoso is a member, in the International Arbitration category.