Greta Thunberg: Since staging a solitary protest outside the Swedish parliament more than a year ago, 16-year-old climate activist Greta Thunberg has channeled the anger felt by millions of teenagers saddled with the prospect of an escalating climate
Volodomyr Zelenskiy: Before Zelenskiy became Ukraine's leader, he played the role of a president in a hit TV series who was forever landing in tricky situations.
Carrie Lam: Hong Kong has been convulsed by sometimes violent protests and mass demonstrations since June, in response to a proposed law by the pro-Beijing chief executive's administration to allow people suspected of crimes on the mainland to be
Megan Rapinoe: The 34-year-old American midfielder emerged as a larger-than-life figure in soccer after leading the United States to a record-extending fourth World Cup title in France in July. When U.S.
Juan Guaido: The president of Venezuela's National Assembly, saying the vote in which President Nicolas Maduro won a second term was a sham, invoked a constitutional provision to declare himself president in January.
Theresa May: Fighting back tears, the British prime minister announced in the summer she would quit after failing to deliver Brexit, setting up a contest that eventually installed Boris Johnson as her successor.
Boris Johnson: The ebullient Brexiteer, who promised to lead Britain out of the European Union with or without a deal, replaced Theresa May as prime minister after winning the leadership of the Conservative Party in July.
Jeffrey Epstein: Financier Jeffrey Epstein was arrested in July and pleaded not guilty to charges of trafficking dozens of underage girls as young as 14 from at least 2002 to 2005.
Abu Bakr al-Baghdadi: The Iraqi jihadist who rose from obscurity to declare himself "caliph" of all Muslims as the leader of Islamic State died in a raid by U.S. special forces in northwest Syria in October.
Tayyip Erdogan: Relations between Washington and Ankara hit a new crisis point in October over Syria, after the Turkish president began a cross-border incursion against America's Kurdish allies and upended the U.S. presence there.
Julian Assange: Sweden dropped a rape investigation against the WikiLeaks founder, ending the near decade-old case that had sent the anti-secrecy campaigner into hiding in London's Ecuadorian embassy to avoid extradition in 2012.
Kim Jong Un: The North Korean leader has warned the United States it has until the end of the year to offer more concessions in denuclearization negotiations or North Korea will pursue an unspecified "new path".
Jacinda Ardern: The New Zealand prime minister was cheered globally for her compassionate and heartfelt support after 51 Muslims were killed in mass shootings in two Christchurch mosques.
Robert Mueller: The special counsel spent 22 months investigating what he concluded was Russian interference in a "sweeping and systematic fashion" in the 2016 U.S. election to help Trump as well as the president's actions to impede the inquiry.
Justin Trudeau: The Canadian prime minister held on to his job in October's election, securing his spot as one of the world's few high-profile progressive leaders, but tarnished by scandal and with his power diminished.
Meng Wangzhou: Huawei's chief financial officer, the daughter of the tech giant's founder, has been detained in Vancouver since December 2018.
Rahaf Mohammed al-Qunun: Saudi Arabia's guardianship system came under scrutiny in January when the Saudi teenager fled from her family and was granted asylum in Canada.
Archie Harrison Mountbatten-Windsor: Prince Harry and his wife Meghan, Duchess of Sussex, welcomed their first child in May.