Editor-in-chief, AFR

Cosima Marriner

Roles

Role	Organisation	Sources
Editor (former)	Sun-Herald	Mumbrella
Editor-in-chief	AFR	Mumbrella (Mon 28 Sep 2026), Mumbrella (Wed 23 Sep 2026), SMH Business, The Age Business

Coverage

Stories naming Cosima Marriner. Where several outlets covered the same round, they are bundled under whichever ran the fullest account.

Funding announcement

AFR editor James Chessell quits to join Joe Aston's Rampart

Long-serving Financial Review editor James Chessell departs Nine to edit Joe Aston's new venture Rampart, which has recently banked $2.3 million from five backers; Cosima Marriner steps up to lead the masthead.

Mumbrella Wed 23 Sep 2026 AFR Bespoke Approach Nine Rampart Sun-Herald Cosima Marriner David Gyngell James Chessell Joe Aston Liam Phelan Tory Maguire

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