Ben Sedley is an experienced clinical psychologist and ACT therapist with fifteen years' experience in both primary health centres and community mental health teams in New Zealand and London, working with children, adolescents, adults and families facing mental health difficulties. Currently, Ben works as a Clinical Practice Advisor at Victoria University of Wellington, and well as maintaining a private practice two days per week.

Ben wrote a PhD dissertation examining children and young people's understandings of mental health, which has helped guide him on the best ways to explain mental health concepts and ACT to young people. His book Stuff that Sucks has received praise from young people, parents and clinicians around the world and was included in the UK Reading Well programme, which has led to it being recommended by GPs across England.

Since the release of that book, Ben has also been active in running workshops across New Zealand and Australia introducing ways to use ACT with young people and will be a trainer at the Melbourne ACT Like a Pro Bootcamp in August 2018. Ben was the coordinator of the Wellington ACT Special Interest Group for 7 years and was Programme Chair and conference coordinator for the Australia and New Zealand ACBS Conference in 2015. In 2010, Ben completed a Victoria University of Wellington course in writing for children.