Abu Hāmed Mohammad ibn Mohammad al-Ghazzālī (1058-1111) (Persian: ابو حامد محمد ابن محمد غزالی), known as Algazel to the western medieval world, born and died in Tus, in the Khorasan province of Persia (modern day Iran). He was a Muslim theologian, philosopher, and mystic of Persian origin and remains as one of the most celebrated scholars in the history of Islamic thought.
Al-Ghazali contributed significantly to the development of a systematic view of Sufism and its integration and acceptance in mainstream Islam. He was a scholar of orthodox Islam, belonging to the Shafi'i school of legal thought of Sunnite Islam and to the Asharite school of theology . Imam Ghazali received many titles: Sharaful A'emma (Arabic: شرف الائمه), Zainud din (Arabic: زین الدین), Hujjatul Islam, meaning "Proof of Islam" (Arabic: حجة الاسلام).
Al-Ghazali remains one of the most celebrated scholars in the history of Islamic thought. He lectured at the Al-Nizamiyya of Baghdad (the highest ranked academy of the golden era of Islamic civilization) between 1091 and 1096. He was the scholar par excellence in the Islamic world. He had literally hundreds of scholars attending his lectures at the Nizamiyyah. His audience included scholars from other schools of jurisprudence. This position won him prestige, wealth and respect that even princes and viziers could not match.
After some years he distributed his wealth and left Baghdad to begin a spiritual journey that lasted over a decade. He went to Damascus, Jerusalem, Hebron, Madinah, Mecca and back to Baghdad where he stopped briefly. He then left for Tus to spend the next several years in seclusion. He ended his seclusion for a short lecturing period at the Nizamiyyah of Nishapur in 1106. Later he returned to Tus where he remained until his death in December, 1111.
He is also viewed as the key member of the influential Asharite school of early Muslim philosophy and the most important refuter of Mutazilites. However, he chose a slightly different position in compare with Asharites; his beliefs and thoughts differ, in some aspects, from the orthodox Asharite school.[2] His 11th century book titled "The Incoherence of the Philosophers" marks a major turn in Islamic epistemology, as Ghazali effectively discovered philosophical skepticism that would not be commonly seen in the West until René Descartes, George Berkeley and David Hume. The encounter with skepticism led Ghazali to embrace a form of theological occasionalism, or the belief that all causal events and interactions are not the product of material conjunctions but rather the immediate and present will of God.
The Incoherence also marked a turning point in Islamic philosophy in its vehement rejections of Aristotle and Plato. The book took aim at the falasifa, a loosely defined group of Islamic philosophers from the 8th through the 11th centuries (most notable among them Avicenna and Al-Farabi) who drew intellectually upon the Ancient Greeks. Ghazali bitterly denounced Aristotle, Socrates and other Greek writers as non-believers and labelled those who employed their methods and ideas as corrupters of the Islamic faith.
In the next century, Averroes drafted a lengthy rebuttal of Ghazali's Incoherence entitled the Incoherence of the Incoherence; however, the epistemological course of Islamic thought had already been set.
Ghazali's influence has been compared to the works of St. Thomas Aquinas in Christian theology (he has been called the "Thomas Aquinas of Islam" by some), but the two differed greatly in methods and beliefs. Whereas Ghazali rejected non-Islamic philosophers such as Aristotle and saw it fit to discard their teachings on the basis of their "unbelief," Aquinas embraced them and incorporated ancient Greek and Latin thought into his own philosophical writings. It is also believed that René Descartes' ideas from his book called "Discourse on Methods" were influenced by Al-ghazali and very much similar to Al-ghazali's work. Thus, some scholars today believe that Descartes was being dishonest in terms of writing the "Discourse on Methods" without giving any academic reference to Al-ghazali's work in his book.
Al-ghazali wrote two of his works in Persian: Kimyayé Sa'ādat (The Alchemy of Happiness) and Nasihatul Mulook (Counseling Kings).
Source: wikipedia.org