Over the past fifteen years, Palestinian-Syrian thinker Fayez A. Sayegh (1922-1980) has received increasing scholarly attention by intellectual historians who recognize how his short monograph “Zionist Colonialism in Palestine” (PLO Research Center, 1965) paved the way for the later use of settler colonialism as a framework for understanding Zionism. This budding interest in Sayegh’s writings, however, has only rarely accompanied deeper study into his life and other work, with the important exception of one biography focused exclusively on his life before 1948. Much of Sayegh’s highly consequential later career – ranging from his years as the leading Arab League spokesmen in the United States in the 1950s, during which time he was the most vocal Palestinian in the country, to his central role in crafting and advocating for 1975 United Nations General Assembly resolution that characterized Zionism as a form of racism while working for Kuwait’s UN delegation – remains unknown to scholars in related fields. This paper will offer a fuller account of Sayegh’s life and activities, which a special emphasis on the forgotten years of his first stint in the United States from the late 1940s to early 1960s, through his work with the PLO in the 1960 and his career in the 1970s as an effectively ‘stateless diplomat’ working for Arab UN delegations in New York. The paper will further try to address why this industrious Palestinian thinker, considered by some to be the most prominent Palestinian voice in the United States prior to Edward Said’s emergence as a public intellectual, remained overlooked for so many years after his untimely passing in 1980. Part of this explanation will include a discussion of the vast, 400-box archive of his papers surprisingly located in Salt Lake City. Other reason may relate to Sayegh’s “falling through the cracks” of subfields given his longtime residence in the United States without being an Arab American or clearly defined as a Palestinian during certain years. In sum, the paper aims to make more scholars aware of Sayegh’s work and his archives while also offering more clarity on basic details of his career.