Muḥammad ibn al-ʿAbbās Abū Bakr al-Khwārazmī, better simply known as Abu Bakr al-Khwarazmi was a 10th-century Iranian poet and secretary, who throughout his long career served in the court of the Hamdanids, Samanids, Saffarids and Buyids. He is best known as the author of the early encyclopedia Mafātīḥ al-ʿulūm (“Key to the Sciences”) in the Arabic language. Life Al-Khwarazmi is a somewhat obscure figure. He was born in 935 in Khwarazm, the birthplace of his father. His mother was a native of Amol in Tabaristan. He periodically refers to himself as al-Khwarazmi or al-Tabari, while other sources refer to him as al-Tabarkhazmi or al-Tabarkhazi. Al-Khwarizmi may have been a nephew of al-Tabari, the prominent Persian historian. For a time, al-Khwarizmi worked as a clerk in the Samanid court at Bukhara in Transoxania, where he acquired his nickname, “al-Katib’’ which literally means “the secretary” or “the scribe”. While at the Samanid court, he compiled his best-known work, Mafātīḥ al-ʿulūm [The Keys of the Sciences], an early Islamic encyclopedia of the sciences, intended as a reference work for court officials. It was produced at the request of Abū l-Ḥasan al-ʿUtbī a vizier in the court of Amir, Nuh II. and the work is dedicated to al-Utbi which establishes a date for its completion of around 977. In Nishapur, Al-Khwarizmi wrote a number of rihla (short, humorous accounts of a journey; partly written in verse and partly in literary prose), of which only fragments survive. Locally, he achieved great fame as a leading scholar and writer. However, his reputation was eclipsed following the arrival of an aspiring young scholar and writer, Badi' al-Zaman al-Hamadani in 383/992. Hamadani composed a new form of prose that gained enormous popularity firstly in Nishapur and later across the Arabic speaking world. This innovative genre that became known as maqama. Al-Khwārizmīand Hamadani fell into competition with each other, exchanged insults and they eventually fell out. Work Al-Khwārizmī authored a work on Arabic grammar, Kitāb kifāyat al-Mutaḥaffiẓ [A Classified Vocabulary of Rare of Difficult Arabic words]. However, he is best known as the author of Mafātīḥ al-ʿulūm (The Keys to the Sciences), an early Islamic Encyclopedia of the Sciences. A monumental work, Mafātīḥ al-ʿulūm is part lexicography and part encyclopedia. Scholars regard it as the first attempt to document the Islamic sciences. The work includes sections on mathematics, alchemy, medicine and meteorology. Editions and Translations Only limited selections of