Claxton started his studies in Oxford in 1404 and was magister in theologia by 1411. He’s regent master for the Oxford Dominicans in 1413. He finishes his Sentences commentary after 1414.
Cf. T. Kaeppeli, Scriptores Ordinis Praedicatorum Medii Aevi, vol. 4, Rome 1970, p. 359 (n° 3782-3783).