Key facts about next Greek PM

He is the eldest son of late prime minister Andreas Papandreou, who founded PASOK and led Greece from 1981 to 1989 and 1993 to 1996. He was hand-picked by then-prime minister Costas Simitis to lead the party in early 2004.

A calm, discreet politician often compared with the towering figure of his father, Papandreou has been a foreign and education minister. He has liberal views on soft drugs and decriminalising marijuana.

He says he wants "green growth", saying an economic model that respects the environment and invests in renewable energy is the only way out of the crisis for Greece.