The former head of Egypt's armed forces, Abdul Fattah al-Sisi, came to prominence as a member of the Supreme Council of the Armed Forces (Scaf), which governed after the fall of President Hosni Mubarak.
He resigned from the military on 26 March 2014 in order to run for president.
This came nine months after he helped to topple the previous president, Mohammed Morsi, who had made him commander-in-chief of the armed forces.
A central figure in the army-backed post-Morsi interim government, Mr Sisi became the object of almost cult-like popular devotion, while showing adeptness as a political tactician.
In February, the Scaf gave him the green light to stand for president, in what it said was a response to the "desire of the masses".
At the same time, interim President Adly Mansour promoted him from general to field marshal - Egypt's top military post.
Mr Sisi launched his election campaign under the slogan "Long Live Egypt", outlining an ambitious plan to develop agriculture, housing, education and impoverished areas and boost employment through "hard work by him and Egyptians alike".
On his plans to combat poverty, he pledged Egyptians would see a better standard of living within two years of him being in power. He called on the private and public sectors to help the poor by opting for "lower profit margins", otherwise the army itself would offer high quality goods at lower prices.
He has also said his victory would mean the Muslim Brotherhood's time would be "finished" and that the discourse of Islamists had to be "rectified".
Mr Sisi's campaign is better-funded than that of rival candidate Hamdeen Sabahi due to the backing of a number of prominent businessmen.
Those who have declared their support include al-Dawa al-Salafiya (The Salafist Call), the Salafist Nour Party, the liberal Free Egyptians Party and the liberal New Wafd Party.
Mr Sisi appears to be genuinely popular. Far from being a stern military figure, he has a softly-spoken but charismatic presence, often seen smiling and known for emotional speeches. At a concert in 2012, his words famously had artists on the stage with him in tears.
Many Egyptians see in him the strong leader needed to overcome the instability that has beset Egypt since the mass protests in Cairo's Tahrir Square ended Hosni Mubarak's long rule in 2011.
But his ascendancy has left some worrying that it heralds a return to the authoritarian security state that prevailed under Mr Mubarak, rendering the Tahrir Square revolution a brief experiment in democracy.
Only a day before the army backed Mr Sisi's rumoured presidential ambitions, the interim government rearranged the post-Morsi authorities' "roadmap" to democracy to ensure that the presidential election will be held before parliamentary polls, and not after, as had been initially intended.
The move left some fearing that the new timetable will allow Mr Sisi to use a likely landslide victory to cement near-complete control over the political system.
Fall of Islamists
Mr Morsi's decision to appoint Abdul Fattah al-Sisi as army chief in 2012 was then actually seen as an attempt to reclaim power from the military, which had assumed interim control after President Mubarak's fall.
The following year, nationwide protests erupted against the Muslim Brotherhood-led government, motivated by anger at at a perceived drift towards greater Islamist influence on public life, as well as continuing economic hardship.
After months of mounting pressure on the government, Gen Sisi effectively delivered the coup de grace with a televised ultimatum warning that the army would intervene if the government did not respond to "the will of the people" and end the crisis within 48 hours.
Hours later, army helicopters threw thousands of Egyptian flags over anti-Morsi protesters in Cairo's iconic Tahrir Square. The cheering crowds responded with chants of "the people and the army are one hand".
But Mr Sisi's rise has not been without controversy.
He is blamed for the deaths of hundreds of people killed in the authorities' crackdown on Islamists since the ousting of President Morsi in July 2013.
Hundreds of Muslim Brotherhood supporters are believed to have been killed in August 2013, when security forces stormed two protest camps in Cairo set up by supporters of Mr Morsi demanding his reinstatement.
The crackdown in Cairo sparked a wave of violence across the country after pro-Morsi supporters attacked government buildings and dozens of Coptic Christian churches were burnt, prompting the authorities to declare a state of emergency.
More people have been killed since the military launched a major campaign against suspected Islamist militants in northern Sinai in September 2013.
The exact figure is not known but the Muslim Brotherhood said in August 2013 up to 2,200 of its supporters had been killed in the crackdown.
Aside from the bloodshed, in April 2012 Mr Sisi also hit the headlines with a statement that appeared to defend "virginity tests" carried out on 17 women detained and beaten by soldiers at an anti-Mubarak protest in Tahrir Square in March 2011.
Gen Sisi said the tests had been done "to protect the girls from rape, and the soldiers and officers from accusations of rape".
Scaf quickly distanced itself from the comments, and Gen Sisi quickly promised to abolish such tests, but the incident was a blow to the military's image.
Despite a long military career, Mr Sisi has little actual combat experience, latterly specialising mainly in military intelligence. On his appointment as army chief, he was the youngest member of Scaf.
Born in Cairo on 19 November 1954, he served in the infantry after graduating from the Egyptian Military Academy in 1977, rising to command a mechanised division.
He went on to serve as information and security chief at the Defence Ministry general secretariat, military attache in Saudi Arabia, chief-of-staff and then commander of Egypt's Northern Military Zone, before being appointed head of Military Intelligence and Reconnaissance.