Google doodle today is Ibn Khaldun
Another source says his name is `Abd al-Rahman bin Muhammad bin Muhammad bin Muhammad bin Al-Hasan bin Jabir bin Muhammad bin Ibrahim bin Abdurahman bin Ibn Khaldun.
He is best known for his Muqaddimah (known as Prolegomenon in English), which was discovered, evaluated and fully appreciated first by 19th century European scholarship, although it has also had considerable influence on 17th-century Ottoman historians like Ḥajjī Khalīfa and Mustafa Naima who relied on his theories to analyze the growth and decline of the Ottoman empire. Later in the 19th century, Western scholars recognized him as one of the greatest philosophers to come out of the Arab world.
Full name Ibn Khaldun
Born 27 May 1332 AD / 732 AH
Died 19 March 1406 AD / 808 AH
Era Medieval era
Region Muslim scholar
School Maliki madhab
Main interests Sociology, Economics
Notable ideas Asabiyyah
source: http://en.wikipedia.org/wiki/Ibn_Khaldun