Nobel laureate Muhammad Yunus has been sworn in as Bangladesh's interim leader, vowing to "uphold, support and protect the constitution".
The 84-year-old took an oath at the presidential palace in Dhaka along with more than a dozen members of his new cabinet, vowing to perform his duties "sincerely".
He flew into the capital, Dhaka, just days after Sheikh Hasina - the woman who ruled Bangladesh with an iron fist for 15 years - fled across the border to India.
Ms Hasina resigned as prime minister after weeks of student-led protests - which left hundreds dead - escalated and culminated in calls for her to stand down.
The decision to name Prof Yunus as chief adviser of the interim government followed a meeting between President Mohammed Shahabuddin, military leaders and student leaders.
The students had been clear they would not accept a military-led government, but wanted Prof Yunus to lead.
Among his new cabinet are Nahid Islam and Asif Mahmud, students who led the anti-government protests.
The hope is Prof Yunus, the so-called banker for the poor, will bring democracy back to Bangladesh after years of autocratic rule.
"People are excited," the entrepreneur and economist told the BBC moments after arriving in Dhaka from France on Thursday.
He later told reporters that Bangladesh "has got a second independence" as he called for the restoration of law and order in the nation of 170 million people.
Following Prof Yunus's swearing in, Indian Prime Minister Narendra Modi offered his "best wishes", writing on X/Twitter that his government was "committed" to working with its neighbour for "peace, security and development".