Evan Davis replaced Adrian Chiles as presenter of the British television show Dragon's Den in 2007.
Chiles presented the first two series, which established the British version of the format after it launched on BBC Two in 2005. Davis took over from series three and became closely associated with the programme's introductions, entrepreneur interviews and investment pitches.
Davis is a British journalist and broadcaster who has also presented BBC news and current-affairs programmes. His role on Dragon's Den is different from that of the Dragons: he does not decide whether an entrepreneur receives investment, but guides viewers through the pitch and explains the business context.
The programme has had several presenters in related international versions, so the answer is specifically about the British series. Davis's long tenure also makes him the presenter most commonly linked with the modern UK edition.