Cassidy was one of the most flamboyant figures in this small community, and in the media coverage of the Napperby artists' first exhibition in Sydney he was identified as leader and spokesman for the painting group, subsequently becoming an elder of the Amnatyerre tribe.
Cassidy's traditional country was Red Hill. Throughout his life he painted the Caterpillar and Goanna Dreamings for this area, along with the Bush Tucker Dreamings from his grandfather's country around the Mt Allan area.
Cassidy Possum Tjapaltjarri passed away in early 2006.
