As bishop, Grosseteste was an indefatigable administrator and zealous reformer, visiting the monasteries, assigning suitable candidates to parish offices, and preaching to the people. Grosseteste fought for the maintenance of the Magna Carta. He thwarted efforts of Henry III to control ecclesiastical appointments, and as a member of the baronial council he supported the reforms of Simon de Montfort (1208-65). Grosseteste did not hestitate to censure Pope Innocent IV for his excessive exactions and for appointing foreigners to rich English benefices; he also attacked the Curia for its corruption and indolence. Some historians see in Grosseteste's protests against Rome an influence upon Wyclif and a foreshadowing of the Reformation.
Grosseteste was a prolific scholar. He knew Greek and probably Hebrew; his translations of, and commentaries on, Aristotle served as a foundation for the scholasticism of Albertus Magnus and Thomas Aquinas. His prolific writing included treatises on physics, optics, light, motion, color, mathematics, astronomy, psychology, pastoral works, and polemical poems in French for the laity. For 50 years after his death he was venerated in his diocese as a saint. In recent years he has been accounted one of the early practitioners of modern scientific method.
Few of Grosseteste'ss writings are available in English. Three treatises are translated in Richard McKeon, Selections from Medieval Philosophers (1928-31). See also S. H. Thomson, The Writings of Robert Grosseteste (1940); J. McEvoy, The Philosophy of Robert Grosseteste (1987); R. Southern, Robert Grosseteste: The Growth of an English Mind in Medieval Europe (1986).