Gladys Berejiklian has been Premier of New South Wales, Australia's most populous state, since January 2017. Her term has encompassed both the devastating bush fires of January 2020 and the COVID-19 crisis.
2020 has seen Berejiklian's response to the COVID-19 pandemic garner praise, with Prime Minister Scott Morrison saying that NSW's management was the "gold standard".
Revelations at the Independent Commission Against Corruption that Berejiklian had been in a long-term relationship with Daryl Maguire, a former member of state parliament and the subject of the commission's inquiry, have caused controversy.
The ICAC revelations were followed by other missteps by the Premier, but whether they will jeopardise her position remains to be seen.
The NSW parliamentary system gives members of the party in government the ability to vote on their leader, and so change the Premier outside of an election. Leaders may also resign and can be removed by the Governor.
Over the last 20 years, NSW has had seven premiers. Of these, one was defeated by a leadership spill, four resigned, and one lost an election. Notably, Barry O'Farrell resigned his premiership in 2014 after it was found he had misled the Independent Commission Against Corruption.
The next election is scheduled for 25 March 2023, although the Governor can dissolve the Legislative Assembly earlier under limited circumstances.
(Based on the short-fuse question by @helpermonkey )