Jack Diamond is a former receptionist who worked in the Emergency Department of Holby General Hospital from 2015 to 2016. His arrival just before Christmas gave him the perfect opportunity to spruce up the ED with decorations. After his arrival, he was friendly to the rest of the staff and has made a generally good first impression on them, despite having annoyed Lofty and Dylan in the new year when he was organising an auction to raise money for the ED. In April 2016, Jack decided to leave the ED to pursue his dreams in the travel industry following a particularly bad shift.