Peter Jones has been a Dragon on every series of the UK show Dragon's Den.
Jones is an English entrepreneur and businessman whose interests have included technology, telecommunications, leisure and media. His long-running place on the panel makes him the only investor to have appeared throughout the British programme's run.
The panel itself has changed repeatedly. Investors such as Duncan Bannatyne, Theo Paphitis and Richard Farleigh were important early dragons, but each later departed. That changing membership is why viewers can easily remember another original investor as the constant panel member.
Jones's continuing presence also gives the series a link between its launch era and later line-ups. The question refers to the UK television version, not every international Dragon's Den adaptation, whose panels are independently selected.