Alok Jha in The Guardian:
Edward Witten is so softly spoken that his voice sometimes threatens to drift away completely. His desk is a jumble of papers and his blackboard a mess of equations. But his hushed words come straight to the point and are infused with understanding and passion.
Witten’s quiet manner belies his status. In his role as de facto scientist-in-chief of string theory, Witten, the Charles Simonyi professor of mathematical physics at the Institute of Advanced Study (IAS) in Princeton, is undoubtedly the heir to Albert Einstein’s title of greatest living physicist. If Einstein were alive today, he would probably be a string theorist, engaged in a remarkable, but still very controversial, theory that claims to explain absolutely everything around us.
More here.