Abū Ḥāmid Muḥammad ibn Muḥammad al-Ghazālī (c.1056–1111) was a Sunni philosopher who taught at Baghdad and Nishapur.
General References
Griffel, Frank, "Al-Ghazali", The Stanford Encyclopedia of Philosophy (Winter 2016 Edition), Edward N. Zalta (ed.), URL = <https://plato.stanford.edu/archives/win2016/entries/al-ghazali/>.
Wikipedia: https://en.wikipedia.org/wiki/Al-Ghazali
More detailed information is available at https://www.ghazali.org/.