Gretel Killeen is the author of many books for both adults and children, including the My Sister is... series, The Night My Bum Dropped and Hot Buns & Ophelia Get a Bloke. She is published in Australia, Europe and Canada. After dropping out of law studies, Gretel started her career as a stand-up comic. She has since worked as a voice actor, columnist, radio presenter and was the host of Big Brother Australia for seven years. She has two (almost) grown-up children and lives in Sydney.