John Gardner lectured in bronze casting techniques at  the Prahran College of Advanced Education, Melbourne, and was a visiting artist at  both the Sydney University summer Art Workshop and  the National Arts School, Sydney. John designed and built bronze sculpture foundries at Alexander Mackie Colleges of Advanced Education. John also owned and operated the Bronze Sculpture workshop & Gallery at Bondi beach.
 
The strength and immediacy of Gardners' work is conveyed well by natural materials like bronze, wood, glass and stone with which he works. As an artist, he is intent on exploring the relationships between mind and matter and the iconography of different cultures.
 
Johns' works belong to both corporate and private collections throughout Australia and the United State.
 
Corporate clients include I N G, Myer, Multiplex, G I O, Baulderstone Hornibrook.