'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' :
Explanation
John Clarke, born in Cambridge, UK, and a professor at the University of California, Berkeley, shared the 2025 Nobel Prize in Physics with Michel Devoret and John Martinis for macroscopic quantum tunnelling in electric circuits. Devoret was born in France, Richard Robson (Chemistry 2025) was born in the UK but works at the University of Melbourne, and Joel Mokyr (Economics 2025) was born in the Netherlands.