List of Famous people born on January 1st

Paul Henry Ginsparg is a physicist. He developed the arXiv.org e-print archive.

Susan Carter Holmes is a botanist and taxonomist at the Royal Botanic Gardens, Kew. She discovered and catalogued more than 200 plants of the family Euphorbiaceae, particularly of the succulent East African members of the genera Euphorbia and Monadenium, as well as about 20 Aloe species. All plants and articles are published under her maiden-name Susan Carter.

Michael Darwin Morley was an American mathematician. At his death in 2020, Morley was professor emeritus at Cornell University. His research was in mathematical logic and model theory, and he is best known for Morley's categoricity theorem, which he proved in his PhD thesis Categoricity in Power in 1962.

Joe Letteri, ONZM is a senior visual effects artist, winner of four Academy Awards, four BAFTA awards and four VES awards. He is the current Director of the Academy Award-winning Weta Digital, having joined the company in 2001. He has received several awards and nominations as visual effects supervisor, the latest being War for the Planet of the Apes. He attended Center High School (Pennsylvania) in 1975 and graduated from the University of California, Berkeley in 1981. He gave the keynote address at UC Berkeley's December Convocation on 19 December 2010.

Luis Alberto Ammann was an Argentine politician of the Humanist Party as well as journalist, schoolteacher and writer.

Michael Howard Harris is an American mathematician and professor of mathematics at Columbia University who specializes in number theory and representation theory. He made notable contributions to the Langlands program, for which he won the 2007 Clay Research Award. In particular, he proved the local Langlands conjecture for GL(n) over a p-adic local field, and he was part of the team that proved the Sato–Tate conjecture.