(S (S (BASENP (NNP Marcus) (NNP du) (NNP Sautoy)) (VP (VBZ is) (NP (NP (BASENP (NNP Professor)) (PP (IN of) (BASENP (NNP Mathematics)))) (PP (IN at) (NP (BASENP (DT the) (NNP University)) (PP (IN of) (BASENP (NNP Oxford)))))))) (PERIOD .))