Khalifa bin Salman Al Khalifa (Arabic: خليفة بن سلمان آل خليفة) (born 24 November 1935) has been the unelected Prime Minister of Bahrain from 1971, hence is the longest-serving prime minister in the world. He still retains his post, although under the 2002 Constitution he has lost some of his power on paper, with Hamad having the authority to appoint and (along with the Bahraini parliament) dismiss ministers. He is the uncle of the reigning King Hamad bin Isa Al Khalifa.
Read more about Khalifa Bin Salman Al Khalifa: Early Life and Education, Career, Marriage and Children, Titles, Styles and Honours