Chairman of the General National Congress: Nouri Abusahmen
Libya's interim parliament elected Nouri Abusahmen as its chairman, and therefore de fact head of state, in June 2013, following the resignation of Mohamed al-Magarief.
Mr Al-Magarief had been elected to head the General National Congress a year earlier, but he stepped down when parliament approved a law debarring officials of the Gaddafi period from office. He had served as ambassador to India in the 1980s.
Mr Abusahmen is an independent MP from western Libya and, significantly, a member of the Berber ethnic minority that suffered discrimination under Col Gaddafi's rule.
The 200-seat Congress, elected in July 2012 in the country's first free polls in decades, saw liberal, secular and independent candidates outflank the Muslim-Brotherhood-aligned Justice and Construction Party.
Mr Abusahmen will serve as Libya's interim head of state until fresh elections are held later in 2013, and will play a major part in drafting a new constitution.
Prime Minister: Ali Zeidan
Mr Zeidan was beaten to the chairmanship of the General National Congress in September by Mohamed al-Magarief, but parliament elected him prime minister a few weeks later in October 2012.
His predecessor, Mustafa Abu Shagur, had failed in two attempts to form a government acceptable to Congress, largely because opposition groups, including the Muslim Brotherhood and the secular National Forces Alliance, felt under-represented.
Mr Zeidan's broad-based interim government - which consists of a mixture of liberal figures and Islamists, and also aims to strike a balance between Libya's various regions - was officially inaugurated in November 2012.
Mr Zeidan, who is close to the National Forces Alliance of former Prime Minister Mahmoud Jibril, was a career diplomat who defected from Col Gaddafi in 1980 along with his boss then and now - the ambassador to India, Mohamed Magarief. During the 2011 civil war he was the opposition National Transitional Council's main point of contact with the European Union, and is credited with winning the rebels recognition by several European countries.
Elected to the General National Congress as an independent, he beat the Muslim Brotherhood's Mohammed Harari to the premiership. His interim government faces the challenge of uniting secular, regionalist and Islamic interests in support of a new constitution and parliamentary elections in 2013.