His name is Yusuf al-Qaradawi. Barry Rubin writes in the JPost:
Up until now, the Egyptian revolution generally, and the Brotherhood in particular, has lacked a charismatic thinker, someone who could really mobilize the masses. Qaradawi is that man. Long resident in the Gulf, he is returning to his homeland in triumph.
Through Internet, radio, his 100 books and his weekly satellite television program, he has been an articulate voice for revolutionary Islamism. He is literally a living legend.
Under the old regime, Qaradawi had been banned from the country. He is now 84 – two years older than the fallen president Hosni Mubarak – but tremendously energetic and clear-minded.
It was Qaradawi who, in critiquing Osama bin Laden and al-Qaida, argued that Islamists should always participate in elections because they would invariably win them. Hamas and Hezbollah have shown that he was right.