Mohamed ElBaradei, a Nobel peace laureate and former head of the UN's nuclear watchdog, has emerged as a leading voice for political reform and likely challenger for Egypt's presidency since returning home in early 2010.
With thousands of demonstrators calling for President Hosni Mubarak to stand down, Mr ElBaradei has emerged as a leading figurehead of the opposition.
He is untested politically in Egypt and it is not clear what constituency he represents, but he may fit the bill as a consensus figure for a period of transition between the old regime and whatever follows it.
Mr ElBaradei joined the International Atomic Energy Agency (IAEA) in 1984 and worked his way up to director general 13 years later.
Look at the pictures it shows how is Egypt now .
