She is investigations editor at The Australian and host of the Sky News Australia program Sharri, which airs 8-9pm Monday - Thursday.

As political reporter for The Sunday Telegraph in Canberra, Markson revealed Tony Abbott missed the $42 billion stimulus package vote in Parliament because he fell asleep after a night of drinking.

In November 2015, she was detained by Israeli security officials for breaching protocol during a visit to the Ziv Medical Centre in Safed by attempting to speak with and maintain contact with a Syrian national being treated at the hospital.

[16] She wrote stories about The Sydney Morning Herald columnist, Mike Carlton's abusive and anti-semitic emails and tweets to readers during the Israel-Hamas conflict in Gaza.

The story was initially met with controversy, with some journalists, commentators, and politicians claiming the affair and pregnancy should have been kept secret from the public.

[21] Later coverage by Markson revealed that Campion had been awarded jobs for which she was not qualified in the offices of other government politicians, and that Joyce had lied about the affair to then-Prime Minister Malcolm Turnbull.

Serkan Ozturk of True Crime News Weekly has claimed that he first broke the story on 24 October 2017, almost six months before Markson's article.

[27] As political editor of The Daily Telegraph, Markson also broke news of the impending leadership coup against Malcolm Turnbull by Peter Dutton.

[38] Markson's analysis defied the majority of polling and public opinion that expected an electoral victory for then-opposition leader Bill Shorten, and rather predicted the Coalition parties would come to win the election by taking a few key seats in Victoria, New South Wales, and crucially, Queensland.

Markson later credited the Coalition victory to a significant turnaround by leader Scott Morrison in key marginal areas.

[42] In May 2020, reporting by Markson in The Daily Telegraph claimed that the Wuhan Institute of Virology could be the source of COVID-19, citing a 15-page government dossier.

[43][44][45] In May 2021, Markson published excerpts of a document that showed Chinese military scientists "discussed the weaponisation of SARS coronaviruses five years before the Covid-19 pandemic".

[47] Shepherd also cited John Lee who pointed out that "the evidence is building and you have significant proportions of the scientific, expert, political and intelligence community saying [the lab leak] is a credible theory.

"[47] On 20 September 2021, Sky News Australia broadcast a documentary by Markson entitled What Really Happened in Wuhan that featured an exclusive interview with former US president Donald Trump, former US Secretary of State Mike Pompeo and former US director of national intelligence John Ratcliffe.