Naturalized citizen in the context of Oath of allegiance

Jacques Mering (3 January 1904–29 March 1973) was a Lithuanian-born, naturalised French engineer, well known in the fields of clay mineralogy and clay science, in graphite studies, and in the applications of X-ray diffraction and electron-optical methods to these.

Mering earned a Diplôme d'Ingénieur en Génie Electrique (Engineering Degree in Electrical Engineering) from École Spéciale des Travaux Publics in Paris in 1925, and Licencié de Sciences (BSc) from Faculté des sciences in Paris in 1928. He rose to become director of research at the Centre National de Recherche Scientifique (CNRS; France's National Centre for Scientific Research) in Paris; subsequently, in 1969, Mering founded and, until his death, directed the CNRS Centre de Recherche sur les Solides à Organization Cristalline Imparfaite (Research Center on Solids with Imperfect Crystalline Organization), in Orléans, France. Mering is also remembered for his formative influence on the British physical chemist Rosalind Franklin, whom he trained in X-ray crystallography in Paris, and who, until her untimely death, produced DNA crystallographic data of exquisite quality.

Max A. Boot (born September 12, 1969) is a Russian-born naturalized American author, editorialist, lecturer, and military historian. He worked as a writer and editor for The Christian Science Monitor and then for The Wall Street Journal in the 1990s. Since then, he has been the Jeane J. Kirkpatrick Senior Fellow in National Security Studies at the Council on Foreign Relations and a contributor to The Washington Post. He has written for such publications as The Weekly Standard, the Los Angeles Times, and The New York Times, and he has authored books of military history. In 2018, Boot published The Road Not Taken, a biography of Edward Lansdale, which was a New York Times bestseller and a finalist for the Pulitzer Prize for biography, and The Corrosion of Conservatism: Why I Left the Right, which details Boot's "ideological journey from a 'movement' conservative to a man without a party", in the aftermath of the 2016 U.S. presidential election. His biography of Ronald Reagan, Reagan: His Life and Legend, was a New York Times Bestseller and named one of the New York Times' 10 Best Books of 2024, as well as one of the year's best books by The Washington Post and The New Yorker.

Eero Saarinen (/ˈeɪroʊ ˈsɑːrɪnən, ˈɛəroʊ -/, Finnish: [ˈeːro ˈsɑːrinen]; August 20, 1910 – September 1, 1961) was a Finnish-American architect and industrial designer. Saarinen's work includes the General Motors Technical Center; the Dulles International Airport Main Terminal; the TWA Flight Center at John F. Kennedy International Airport; the Vivian Beaumont Theater at Lincoln Center; the Gateway Arch; and the IBM Thomas J. Watson Research Center. During his career, Saarinen was elected a Fellow of the American Institute of Architects and served on the National Institute of Arts and Letters.

Born in Hvitträsk, Finland, he was the son of Finnish architect Eliel Saarinen, and immigrated to the United States as a teenager. Saarinen grew up in Bloomfield Hills, Michigan, studying at the Cranbrook Academy of Art, where his father taught. Saarinen became a naturalized citizen of the United States in 1940, a year after marrying the sculptor Lilian Swann, with whom he had two children. After divorcing Swann in 1954, Saarinen married Aline Bernstein Louchheim. In 1961, Saarinen died while undergoing an operation for a brain tumor.

Nikola Tesla (10 July 1856 – 7 January 1943) was a Serbian-American engineer, futurist, and inventor. He is known for his contributions to the design of the modern alternating current (AC) electricity supply system.

Born and raised in the Austrian Empire, Tesla first studied engineering and physics in the 1870s without receiving a degree. He then gained practical experience in the early 1880s working in telephony and at Continental Edison in the new electric power industry. In 1884, he immigrated to the United States, where he became a naturalized citizen. He worked for a short time at the Edison Machine Works in New York City before he struck out on his own. With the help of partners to finance and market his ideas, Tesla set up laboratories and companies in New York to develop a range of electrical and mechanical devices. His AC induction motor and related polyphase AC patents, licensed by Westinghouse Electric in 1888, earned him a considerable amount of money and became the cornerstone of the polyphase system, which that company eventually marketed.

Har Gobind Khorana (9 January 1922 – 9 November 2011) was an Indian-American biochemist. While on the faculty of the University of Wisconsin–Madison, he shared the 1968 Nobel Prize for Physiology or Medicine with Marshall W. Nirenberg and Robert W. Holley for research that showed the order of nucleotides in nucleic acids, which carry the genetic code of the cell and control the cell's synthesis of proteins. Khorana and Nirenberg were also awarded the Louisa Gross Horwitz Prize from Columbia University in the same year.

Born in British India, Khorana served on the faculties of three universities in North America. He became a naturalized citizen of the United States in 1966, and received the National Medal of Science in 1987.