The Hills Anaesthetic Group is comprised of a group of highly skilled and qualified specialist anaesthetists with both local and overseas training. Calese Pty Ltd, a management company, owns the rooms and provides services to the anaesthetists who practice as individuals.

The anaesthetists in the group co-operate to provide locum cover to associates in the group (as well as to other anaesthetists outside the group) for holidays and ill-health. Anaesthesia and pain management services are provided to over 70 surgeons and other specialist medical providers in Sydney.

Group anaesthetists provide services at The Hills Private Hospital, Westmead Hospital, Westmead Private Hospital, Castle Hill Day Surgery, Nepean Hospital, Nepean Private Hospital, Hawkesbury & District Hospital, Concord Hospital, Mt Druitt Hospital, Mater Hospital, North Shore Private Hospital, Prince of Wales Private Hospital, Holroyd Private Hospital, Sydney Private Hospital, Minchinbury Community Hospital and many other hospitals and day surgery units throughout greater metropolitan Sydney.