(S (S (BASENP (NNP Dr.) (NNP Cerf)) (VP (VBZ is) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (DT the) (NNS fathers)) (PP (IN of) (BASENP (DT the) (NN Internet)))))))))))) (PERIOD .))