Following several solo art exhibitions, Heather Gall collaborated with Jill Morris to produce the illustrations for the chapter book Frog Thunder (2001). She again worked with the noted children's author to illustrate Morris's Kookaburra School (2002) and Koala Number One (2004). Gall has conducted art workshops instructing both adult groups and in schools.
She has lived on a dairy farm at Bald Knob near Maleny, Queensland.