Denis Stewart is widely recognised as the Godfather of Australian Herbalism—a pivotal figure in the modern development of herbal medicine in Australia. His influence spans more than five decades of clinical practice, education, and advocacy in natural therapies.

Stewart’s journey in herbal medicine began in the early 1970s, a time when interest in alternative health approaches was growing. He is credited with spearheading a Renaissance in Australian herbal medicine by establishing formal training and professional standards for the discipline. At the National Herbalists’ Association of Australia, he developed professional examinations, curricula, and course studies that helped shape herbalist education nationally. He also established and taught the first three-year, full‑time program in herbal medicine at the NSW College of Naturopathic Sciences.

In the late 1970s, Stewart founded the Southern Cross Herbal School, offering undergraduate and postgraduate herbal medicine programs and training many of Australia’s leading practitioners. Later, from 2002 to 2007, he served as a Conjoint Associate Professor at University of Newcastle, helping develop its Bachelor of Herbal Therapies degree.

Stewart’s contributions have been widely recognised: he was inducted into the Australian Traditional Medicine SocietyHall of Fame and awarded life membership for his service to the industry. Beyond formal education and practice, he has also shared his expertise via a long‑running radio program, Health Naturally with Denis Stewart, where he discusses herbal approaches to health and well‑being.

Through his teaching, clinical work, curriculum development, and advocacy, Denis Stewart has had a profound impact on the evolution of herbal medicine in Australia, earning him a reputation as one of the field’s most influential figures.