He is known for writing a number of works based upon the teachings of the liberal arts, with one of his most renowned poems, De planctu Naturae ("The Complaint of Nature"), focusing on sexual conduct among humans.

Though the only accounts of his lectures seem to show a sort of eccentric style and approach, he was said to have been good friends with many other masters at the school in Paris, and taught there, as well as some time in southern France, into his old age.

He afterwards inhabited Montpellier (he is sometimes called Alanus de Montepessulano), lived for a time outside the walls of any cloister, and finally retired to Cîteaux, where he died in 1202.

[4] Among his numerous works two poems entitle him to a distinguished place in the Latin literature of the Middle Ages; one of these, the De planctu Naturae, is an ingenious satire on the vices of humanity.

[4] One of Alain's most notable works was one he modeled after Boethius’ Consolation of Philosophy, to which he gave the title De planctu Naturae, or The Plaint of Nature, and which was most likely written in the late 1160s.

She has only the ability to create a soulless body, and thus she is "persuaded to undertake the journey to heaven to ask for a soul," and "the Seven Liberal Arts produce a chariot for her... the Five Senses are the horses".

Another of his theological textbooks that strove to be more minute in its focus, is his De Fide Catholica, dated somewhere between 1185 and 1200, Alan sets out to refute heretical views, specifically that of the Waldensians and Cathars.

Certain facts of their lives have been attributed to him, as well as some of their works: thus the Life of St Bernard should be ascribed to Alain of Auxerre and the Commentary upon Merlin to Alan of Tewkesbury.

Alan of Lille was not the author of a Memoriale rerum difficilium, published under his name, nor of Moralium dogma philosophorum, nor of the satirical Apocalypse of Golias once attributed to him; and it is exceedingly doubtful whether the Dicta Alani de lapide philosophico really issued from his pen.

In addition to his battle against moral decay, Alan wrote a work against Islam, Judaism and Christian heretics dedicated to William VIII of Montpellier.