Fakhr al-Din al-Razi

Fakhr al-Dīn al-Rāzī or Fakhruddin Razi (Persian: فخر الدين رازي‎) was an Iranian Sunni Muslim theologian and philosopher He was born in 1149 in Rey (in modern-day Iran), and died in 1209 in Herat (in modern-day Afghanistan). He also wrote on medicine, physics, astronomy, literature, history and law.
He left a very rich corpus of philosophical and theological works that reveals influence from the works of Ibn Sīnā, Abu'l-Barakāt al-Baghdādī and al-Ghazali.

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Berak Hussain, Berak Hussain is a Registered Psychotherapist (RP) in Canada. She has a BA in Psychology and a Masters in Educational Counseling from the University of Ottawa. She speaks on a variety of Islamic... Answer updated 2 years ago

Salamu Alaikum.  I came across this fascinating article which describes in detail the contributions of a variety of scholars to the field of psychology.  I hope that this can help answer some of your questions.

https://www.jstor.org/stable/pdf/27512819.pdf 

Al-islam.org also has some information on this specific scholar : https://www.al-islam.org/history-muslim-philosophy-volume-1-book-3/chapter-32-fakhr-al-razi