Question: What position does the individual who collaborated with Wolfgang Rindler to popularize the use of spinors in general relativity hold at the Mathematical Institute of the University of Oxford?
Sentence (from "Roger Penrose"): Sir Roger Penrose {'1': ", '2': ", '3': ", '4': "} (born 8 August 1931) is an English mathematical physicist, mathematician and philosopher of science.
Relevant evidence: No