Josh Greenbaum is an American governmental official and former financial and investment expert who has recently stepped into a significant role as an advisor to former President Donald Trump. Starting in January 2025, as part of Trump’s second administration, Greenbaum was appointed commissioner of the Federal Acquisition Service, a key agency in the General Services Administration. His background combines legal, managerial, and financial experience, which positions him well for his new responsibilities.

After the signing of the Sharm El Sheikh ceasefire agreement for Gaza in December 2025, Greenbaum's public role expanded to include diplomatic efforts. He began collaborating closely with U.S. Middle East envoy Steve Witkoff and Trump’s son-in-law Jared Kushner. This strategic collaboration indicates a shift in focus towards peace initiatives in the region, highlighting the intertwining of political maneuvers and peace efforts under Greenbaum's guidance.

By early 2026, Greenbaum’s influence increased as he became a senior advisor to Trump and a diplomatic advisor to the "Gaza Peace Council." He has been tasked with leading strategic planning, daily operations, and turning the council's priorities into actionable plans. Greenbaum was born in the early 1980s in New Jersey and grew up in an Orthodox Jewish community, being the grandchild of a Holocaust survivor, which may inform his interests and motivations in diplomatic efforts regarding the Israeli-Palestinian conflict.