Abu Ja'far Muhammad ibn Musa al-Khwarizmi

lived from 780 to 850

Al'Khwarizmi was an Islamic mathematician who wrote on Hindu-Arabic numerals and was among the first to use zero as a place holder in positional base notation. The word algorithm derives from his name. His algebra treatise Hisab al-jabr w'al-muqabala gives us the word algebra and can be considered as the first book to be written on algebra.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Al-Khwarizmi.html