Often, presenters may double for being famed in other fields, such as an
actor,
model,
comedian,
musician,
doctor, etc. Others may be subject-matter experts, such as scientists or politicians, serving as presenters for a programme about their field of expertise (for instance,
David Attenborough). Some are celebrities who have made their name in one area, then leverage their fame to get involved in other areas. Examples of this latter group include British comedian
Michael Palin who now presents programmes about
travel (such as
Around the World in 80 Days), and American actor
Alan Alda, who presented
Scientific American Frontiers for over a decade. Another example would be American stand-up comedian
Joe Rogan, who is a commentator and post-fight interviewer in
UFC. The term is commonly used in many countries including Canada, New Zealand, The Netherlands, Liechtenstein, Barbados,
Sri Lanka, India, Spain, Denmark, Greece, Australia, Egypt, Andorra, Malta, San Marino, Japan and South Korea. ==United States ==