Mark Isaacs is a writer, an author, a researcher and a community worker. His first book, The Undesirables: Inside Nauru (Hardie Grant, 2014), is an account of his work with asylum seekers in Nauru, one of Australia's notorious offshore detention centres. His second book, Nauru Burning (Editia, 2016), follows up The Undesirables with an investigative report on human rights abuses on Nauru.

In 2017, Mark conducted an investigation into deportations to Afghanistan with the Edmund Rice Centre. The published report is called "Responsibility to Protect" and is available online for free download. Mark is currently writing another book for Hardie Grant about a community of peace activists in Afghanistan which will be published in May 2019. He is also studying a Doctor of Philosophy at the University of Technology, Sydney.

His research will focus on human migration in the Asia-Pacific region. Mark is president of Sydney PEN, an affiliate of PEN International, a worldwide association of writers which defends freedom of expression and campaigns on behalf of writers who have been silenced by persecution or imprisonment. Mark works as a community worker, while he writes as a freelancer.

He has published articles with The Guardian, Foreign Policy, World Policy Journal, Sydney Morning Herald, Huffington Post, VICE, New Internationalist, Mamamia, New Matilda, The Griffith Review, Pacific Standard, Overland, Conscious Magazine, The Vocal, Right Now and Roads and Kingdoms.