He became a naturalized citizen of the United States of America in 1944.

He became a naturalized citizen of the United States of America in 1944.

He became a naturalized citizen of the United States in 1950.

He became a naturalized citizen of the United States in 1989.

He became a naturalized citizen of the United States in 1966, and subsequently received the National Medal of Science.

He became a naturalized citizen of the United States in 1987.

He became a naturalized citizen of the United States in 1942, the same year that his parents were killed by the Nazis.

He became a naturalized citizen of the United States in 1836.

He became a naturalized citizen of the United States on May 2, 2000.

He became a naturalized citizen of the United States on August 4, 2003

He became a naturalized citizen of the United States on October 17, 2005.

He became a naturalized citizen of the United States in September 1870.

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