He was innate at Champeaux near Melun. Fallowing researching under Anselm of Laon and Roscellinus, he taught in the school of the cathedral of Notre-Dame, of which he was made canon around 1103. Among his pupils was Pierre Abélard. Around 1108 he retired into the abbey of St Victor, in which he resumed his lectures. He subsequently became bishop of Châlons-en-Champagne, and participate in the dispute on investitures as a supporter of Pope Callixtus II, whom he represented at the conference of Mousson.

His exclusively printed works come the fragment on the Eucharist (inserted by Jean Mabillon in his edition of the works of St Bernard), & The Moralia A brevi ala and De Origine Animae (within E. Martnes Thesaurus novus Anecdotorum, 1717, vol. Five). In a survive one he maintains that toddlers world health organization die unbaptised must exist as wasted, the pure soul existence defiled per raunch of the person, & declares that God's may is does'nt to become questioned. He upholds a theory of Creationism (that a soul is specially created for every human). Ravaisson-Mollien has discovered a total of fragments by him, among which the first is the first state Essentia Dei et de Substantia Dei; the Liber Sententiarum, consisting of discussions in ethics & Scriptural interpretation, is likewise ascribed to Champeaux.

He is considered a founder of extreme realism, a philosophy which held that universals exist independently of both the mortal mind & particular objects (a philosphy that followed in from either Platonic realism).

fr:Guillaume de Champeaux