Alexander Siddig Siddig El Tahir El Fadil El Siddig Abderahman Mohammed Ahmed Abdel Karim El Mahdi was born in Sudan but spent most of his life in England. He was initially credited under the shortened name Siddig El Fadil, until his appearance in Star Trek: Deep Space Nine. He has made prominent appearances in Reign of Fire and Kingdom of Heaven. In 2003 he guest-starred as an Algerian secret agent on the trail of Islamic extremists in "Nest of Angels", a controversial episode of Spooks, a British television show in its second season. In 2005, Siddig gave a critically lauded performance as Prince Nasir in Syriana alongside George Clooney and Matt Damon.
His roles have often called for him to act out many different accents: an English "RP" accent (Deep Space Nine), a cockney accent (Reign of Fire), and an Algerian accent (Spooks), among others.
Siddig married fellow Star Trek actor Nana Visitor in 1997. They had a son who was born in 1996, Django El Tahir El Siddig. Siddig and Visitor divorced in 2001.
Siddig is the nephew of English actor Malcolm McDowell and of former Sudanese Prime Minister Sadiq al Mahdi.