Brian was born in New Zealand. Even at school he knew that he wanted to be a writer. It took him thirty years to realise that dream when his first junior novel, Henry and the Flea, was published in 2003.
He had studied computers at university but dropped out to pursue his love of writing. He trained as a journalist, and then worked as a reporter and an advertising copywriter, a radio announcer and an Internet developer before finally becoming an author.
In 2005 Super Freak was nominated in the Junior Fiction category of the 2006 New Zealand Post Book Awards. The Tomorrow Code (2008) was nominated in the Young Adult Fiction category of the 2009 New Zealand Post Book Awards, and the 2009 LIANZA Children's Book Awards. Most recently, Falkner's Battlesaurus: Rampage at Waterloo (2015) was shortlisted for the 2016 NSW Premier's Awards, and won the Young Adult Fiction category of the 2016 New Zealand Book Awards for Children and Young Adults.
Falkner now lives in Queensland, Australia.