David Hockney was born on July 9, 1937, in Bradford, England, to Laura and Kenneth Hockney. He currently lives and spends most of his time at his long-term residence in Southern California, I am unable to find details on wheter he is a US citizen, either solely or with dual nationality. And I am no longer in touch with any of his representatives. I actually went to the same school as him! (a fair few years later mind you). Hopefully this is of some use to you!