Dr Walker has a medical practice in Lindfield on the upper north shore of Sydney. He provides a service in all aspects of echocardiography, focusing on stress echocardiography which is a well accepted, accurate method for assessing heart disease, not involving irradiation or injections.
Dr Walker commenced stress echocardiography in 1992 and has since performed over 50,000 studies & 80,000 transthoracic echocardiograms. Stress echocardiography provides much more information to the practitioner than stress testing alone.
Dr Walker introduced coronary calcium scoring into Australia in 1999 in conjunction with the Sydney Adventist Hospital.
His other area of expertise is in the field of preventative cardiology and he has also commenced a related service in arterial screening, which is an indirect measure of endothelial function and arterial stiffness, and does not involve irradiation or injections. Dr Walker has published 7 best selling books on preventative cardiology and lectures both nationally and internationally on this subject.