Callum Johnston is a skilled Incident Management practitioner with a background in technology and emergency services. He holds a Diploma of Public Safety (Emergency Management) from ACIM Solutions, and has worked for organizations such as NSW Health and St John Ambulance Australia.

Johnston has experience in a variety of fields, including Infrastructure, Project Management, Geospatial Information Systems, Process improvement, Networking, Technical Support, Data Analytics & Network Security. He has also worked in Unified Communications and collaborative technology systems. Additionally, Johnston is invested in Event medical, Mass gathering health risk mitigation, and Pre-hospital care. He has provided medical support to Event Health Services within St John Ambulance Australia as an accredited Advanced Responder.

Johnston's roles have included Team Leader - Public Health Response Branch at NSW Health, Event Health Responder and Planning Officer - Incident Management Team - COVID-19 at St John Ambulance Australia, and IT Service Desk Administrator at Staging Connections Group Limited.