X', born in the UK, was conferred the Nobel Prize in 2025. He was a professor in an American university when this prize was announced. Identify 'X' :<br/>

John Clarke matches both clues: the 2025 Nobel Physics press release describes him as born in Cambridge, UK, and Professor at the University of California, Berkeley, USA. Michel H. Devoret was born in Paris, France, and Richard Robson, though UK-born, was affiliated with the University of Melbourne, Australia.