He commenced surgical training at Royal Perth and Sir Charles Gairdner Hospitals in the areas of general, cardiac, vascular and plastic surgery. He moved to NSW in 2001 and continued working as a registrar in plastic and vascular surgery at Royal North Shore and Hornsby Hospital. This was followed by a year of general and cardiac surgery at John Hunter Hospital in Newcastle in 2003.

Dr Lilleyman has been involved in the treatment of varicose veins since 2000 and joined Dr Chirgwin in the treatment of venous disease in 2005.

He is a member of the Australasian College of Phlebology and ANZ Society of Phlebology.

Dr Lilleyman is able to offer advice in relation to the general treatment of varicose veins and their complications and to offer a wide range of treatments including Sclerotherapy, Microsclerotherapy, Ultrasound Guided Sclerotherapy, Ambulatory Phlebectomy and Endovenous Laser Treatment (EVLT®).

Dr Lilleyman also practices in the area of skin cancer surgery at the Hunter Skin Cancer Clinic, is a member of the Skin Cancer Society of Australia, Associate of the Mater Melanoma Unit and course coordinator of the Masters in Skin Cancer Medicine.