Profile: Arvind Kejriwal
Leading Indian anti-corruption activist Arvind Kejriwal made a spectacular political debut in December. His party won 28 seats in Delhi's state assembly, propelling him to the post of chief minister in the capital.
But he was only to be in office for 49 days, resigning amid a row over an anti-corruption bill.
When Mr Kejriwal first broke off from his mentor, veteran campaigner Anna Hazare, to formally enter politics last year, many said he would find the going tough without Mr Hazare's support.
But, Mr Kejriwal proved his detractors wrong, as the Delhi election results show - his Aam Aadmi Party (AAP) or the Common Man's Party won 28 seats out of the 70 seats on offer.
His next move is bound to be on the national stage. Mr Kejriwal has said his party will contest the general election due by May.
Mr Kejriwal launched his political party on 2 October 2012, the 143rd birthday of Mahatma Gandhi. He told supporters they would fight against the culture of "bribe-taking" and pledged to contest the 2014 election.
End Quote Arvind Kejriwal Anti-corruption activist
From today, the people are entering politics - corrupt leaders, count your days”
Explaining the need for a new party, he said India was "being sold and all parties are guilty".Backroom organiser
A former civil servant, Mr Kejriwal won the Ramon Magsaysay award for emergent leadership, widely described as Asia's Nobel Prize, for social work and initiatives to fight corruption in 2006.
Two years ago, he set up a group called India Against Corruption aimed at putting pressure on the government to bring about tough anti-corruption laws.
Mr Kejriwal, 44, came to the limelight in 2011 as the backroom organiser of the anti-corruption campaign led by Mr Hazare.
While Mr Hazare, 73, was its recognised public face, Mr Kejriwal was a member of "Team Anna", which worked tirelessly behind the scenes to make the agitation a success.
As Mr Hazare went on hunger strike in April 2011 to demand stringent anti-corruption laws, in particular a law to create an ombudsman to deal with allegations of corruption, Mr Kejriwal was by his side, making speeches, briefing reporters and formulating strategy.
In August of the same year, when Mr Hazare brought the government to its knees with his 12-day fast, Mr Kejriwal emerged as his top aide, rallying huge crowds, advising the veteran campaigner and participating in negotiations with the government.Loss of faith
Born in 1968 in the town of Hisar in the northern state of Haryana to middle-class parents, Mr Kejriwal graduated from the prestigious Indian Institute of Technology (IIT) in Kharagpur with a degree in mechanical engineering.
After a brief stint working with the private sector Tata group, he joined the Indian civil services in 1992 as a revenue officer.
He took voluntary retirement from his job in 2006 and set up an NGO - Public Cause Research Foundation - to work full time to promote transparency in government and to create awareness about the Right to Information movement.
According to a report in The Caravan magazine, Mr Kejriwal has "no personal story of extraordinary suffering at the hands of corruption".
"What led him to quit his job as a senior bureaucrat and become an activist wasn't anger or bitterness; it was the loss of his own faith in government after a decade in its service," it says.
In a draft document, Mr Kejriwal outline some of the objectives of his party, which included devolution of power, fighting corruption, containing inflation and ensuring fair prices for farm products.
He said at the time: "From today, the people are entering politics. Corrupt leaders, count your days."
His initial protests attracted small crowds and his opponents said it was unlikely that he would be able to translate the public anger over corruption into votes for his political party.
But the Delhi election results have proved his critics wrong with the Aam Aadmi Party showing that it can do serious damage to both of India's main political parties.
During his administration's brief time in office, Mr Kejriwal unveiled a series of headline-grabbing initiatives, including an anti-corruption hotline to help people deal with demands for bribes by government workers.
In January, he spent two nights in the open as part of a mass sit-in to press the federal government to grant him greater control over the city police.
But the true crunch time came when a row broke out over anti-corruption bill he had pushed for.
The law would have created a Citizens' Ombudsman, or Jan Lokpal, an independent body with the power to investigate politicians and civil servants suspected of corruption.
But opposition politicians blocked the bill, arguing it was unconstitutional to introduce legislation that did not have the approval of the federal government.
Mr Kejriwal had threatened to quit if the bill did not go through, and duly did so - announcing his resignation to his supporters outside his party headquarters.
Analysts say that even if Mr Kejriwal and his party are unable to keep their promise to bring about "a complete political revolution" in the next general election, they would at least have the satisfaction of changing the political discourse.