Sophie Hardcastle is an author and artist currently studying a Bachelor of Fine Arts at Sydney College of the Arts, majoring in painting. Sophie's memoir, Running like China, is published by Hachette and was released in September 2015. Her debut novel, Breathing Under Water, was published by Hachette in July 2016.

In addition to her books, Sophie has written for various magazines, including ELLE , Harper's Bazaar and Surfing World , and has also written for theatre. Sophie is now a mental health spokesperson for Batyr. She shares her experiences with bipolar 1 disorder by speaking in schools around the country. Sophie was recently named as one of Triple j's '25 Under 25 who are nailing it!'.