Professor Martin Rees, University of Cambridge. He wears various hats: Master of Trinity College, Lord Rees of Ludlow, and President of the Royal Society. You can take a look at his most distinguished career here:
Trinity:
www.trin.cam.ac.uk/index.php?pageid=172
Wiki:
en.wikipedia.org/wiki/Martin_Rees,_Baron_Rees_of_Ludlow
RS:
royalsociety.org/page.asp?id=2220 