Linda Thomas-Greenfield, former United States Ambassador to the United Nations, has joined APCO as senior advisor, APCO Founder and Executive Chairman Margery Kraus announced today.

“Linda’s extraordinary diplomatic career and her deep expertise in African affairs will be a tremendous asset to APCO and our clients,” said Kraus. “Her ability to navigate complex geopolitical landscapes and foster meaningful partnerships is unmatched, and we are thrilled to welcome her to our team. As APCO’s work continues to expand across the African continent, Linda’s insights will strengthen our ability to support clients and seize new opportunities in this dynamic and rapidly evolving region.”

“I am honored to join APCO, a firm renowned for its commitment to impactful advocacy and strategic counsel on the world’s most pressing issues,” said Thomas-Greenfield. “APCO’s global reach and dedication to helping clients drive positive change align closely with my own values and experience. I look forward to working alongside this talented team to support clients as they engage with an increasingly interconnected world.”

Thomas-Greenfield is a distinguished American diplomat who served as the 31st U.S. Ambassador to the UN from 2021 to 2025, representing the United States at the highest levels of international diplomacy and serving as a member of the president’s Cabinet. Prior to her UN appointment, she was the U.S. Assistant Secretary of State for African Affairs from 2013 to 2017, where she played a pivotal role in shaping U.S. policy across the African continent and advancing partnerships on issues ranging from economic development to peace and security.

Throughout her four-decade career in foreign service, Thomas-Greenfield held senior diplomatic posts in Liberia, Nigeria, Switzerland, Pakistan, Kenya, Gambia and Jamaica. She is widely recognized for her commitment to multilateralism, her advocacy for inclusive global governance and her ability to build consensus on complex international challenges.

APCO is a leading global advisory and advocacy communications consultancy, known for its expertise in public affairs, government relations and global diplomacy. With a diverse team of experts and a presence in major markets around the world, APCO helps clients navigate complex environments, build trusted relationships and achieve lasting impact.

About APCO

APCO is a global advisory and advocacy firm helping leading corporations, foundations and governments navigate a complex world. An independent and majority women-owned company, APCO brings diverse people and ideas together and works beyond traditional boundaries, building the un/common ground upon which progress is made.

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