Beirut - Those who knew Bashar Assad in earlier days say he was uncomfortable being the son of a president and never wanted to lead. A soft-spoken, lisping eye doctor, he enjoyed Western rock music and electronic gadgets - an accidental heir to power.

Yet Assad, who turns 48 on Wednesday, has proven to be relentlessly resilient, branded by opponents a brutal dictator who kills with chemical weapons.

His willingness to do whatever it takes in Syria's civil war, unleashing his military's might against entire towns and cities, has so far succeeded in keeping his regime core in power, even as large swaths of his country fall from his control or turn into devastated killing fields.

Nearly three years into the uprising against his family's more than 40-year-rule, he has defied every prediction that his end is near.

The West once had the impression Assad was weak or incompetent, said David Lesch, professor of Middle Eastern history at Trinity University in San Antonio. "It took this unleashing of violence and bloodshed for people to reassess their view of Bashar."

In the eyes of opponents, Assad is a murderous autocrat who would do anything to cling to power. The U.S and its allies accuse him of resorting to gassing his own people, a claim the regime denies.

But for his supporters, he is a nationalist hero fighting Western imperialism and ensuring stable, secular rule in a turbulent region wracked by sectarian wars.

Bashar Assad's first months as president after succeeding his father in 2000 ushered in hopes he would loosen his father's iron grip. Even after it became clear he too would not tolerate dissent, he was still portrayed by many as a reformer at heart, fighting against an old guard who restricted his ambitions.

Even some of his strongest critics in the current war once believed he could be a positive factor.

As a senator, U.S. Secretary of State John Kerry visited him repeatedly, dining with Assad and his wife at a restaurant in Old Damascus in 2009. Former French President Nicholas Sarkozy invited him to Bastille Day celebrations in 2008. Even after his forces fired on protesters at the beginning of the uprising against him in March 2011, Hillary Clinton suggested he was different from his father - a "reformer" who should be given a chance.

Assad came to power by a twist of fate.

The elder Assad was cultivating Bashar's older brother Basil to succeed him. But in 1994 Basil was killed in a speeding car crash in Damascus. Bashar was summoned home from his ophthalmology practice in London, put through military training and elevated to the rank of colonel to establish his credentials so he could one day rule.

When Hafez Assad died in 2000, parliament quickly lowered the presidential age requirement from 40 to 34. Bashar's elevation was sealed by a nationwide referendum, in which he was the only candidate.

"When his father called him, he wasn't ready to take power. He tried to get his younger brother to take his place," said Quemener, referring to Maher Assad, who now heads the powerful Presidential Guard.

"His destiny was forced on him, he never wanted to be leader of Syria."

The Syria that Hafez left his son was molded by 30 years of hidebound rule, with a Soviet-style centralized economy. The hand over dissent was so stifling that Syrians feared even joking about politics to their friends.

The younger Assad seemed a breath of fresh air.

Lanky with a slight lisp, he talked of his love of computers - in fact, his only official position before becoming president was head of the Syrian Computer Society. Assad enjoyed listening to Phil Collins and British rock group ELO, Lesch recalls.

His wife, Asma al-Akhras, whom he married several months after taking office, was attractive, stylish and grew up in a west London suburb. The young couple, who eventually had three children, seemed to shun trappings of power. They lived in an apartment in the upscale Malki district of Damascus, as opposed to a palatial mansion like other Arab leaders, and made surprise appearances in public, to the delight of their supporters.

The charming first lady provided a counterpoint to Bashar's geeky demeanor. Together they gave the appearance of a power couple who could bring progressive values to Syria.

One of the young female aides in his presidential office even referred to Assad as "the Dude," a familiarity inconceivable with his father, according to a trove of emails purportedly leaked from Bashar and Asma Assad's accounts and made public in late 2011 by London's The Guardian newspaper and WikiLeaks.

Hopes for a political opening dissipated quickly. Early on, Assad reversed a brief loosening of restrictions on political activity. Instead, he opened up the economy. Under free-market reforms, Damascus and other cities saw a flourishing of malls, restaurants and consumer goods. Tourism swelled.

Officials and Western diplomats who met with Assad speak of a vain man, convinced his was the only right way.

Assad sees himself "as a sort of philosopher-king, the Pericles of Damascus," Maura Connelly, then-U.S. charge d'affaires in Damascus, wrote in a June 2009 secret diplomatic cable, released by WikiLeaks.

Assad's gravest challenge came when small protests erupted in the country's drought-stricken south in March 2011 and spread quickly to other areas, at the time of the Arab Spring uprisings.

His response was to use the brutal tactics of his father, hoping to nip the protests in the bud.

Security forces repeatedly opened fire on protesters. But the outrage only caused a snowball effect. As the uprising hemorrhaged into civil war, Assad unleashed his military to blast opposition-held cities, as well as the pro-regime gunmen known as "shabiha," alleged to have carried out mass slayings.

His actions squandered the goodwill of those who still saw him as an instrument of change. Even the first lady was tarnished. The leaked emails showed her splurging on expensive jewelry, bespoke furniture and a vase worth more than $4,000 from Harrods department store in London, even as violence engulfed the country.

Assad turned to his family, but now that circle is dwindling. His younger brother, Maher, is still by his side but his elder sister, Bushra, a strong voice in his inner circle, is now said to be living in the United Arab Emirates. Her husband, Deputy Defense Minister Assef Shawkat, was killed in a Damascus bombing last year. One of his closest confidantes, former elite commander Manaf Tlas, defected.

Quemener said only two people can reason with him at this point: His mother and his wife.

"Like all dictators he's very alone, so he's forced to take decisions, and that tortures him."