Associate Professor Daniel O'Brien is an infectious disease physician completing his medical degree in 1990 at Melbourne University. Undergoing residency in infectious diseases medicine in 1997 at the Royal Melbourne and Royal Darwin Hospitals.

Daniel was admitted to fellowship of the Royal Australian College of Physicians in 1999 and is now based in Geelong, where he consults privately and is accredited with University Hospital Geelong and St John of God Geelong Hospital.