<Tr> <Th> Occupation </Th> <Td> Actor </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1989--present </Td> </Tr> <P> Martin Henderson (born 8 October 1974) is a New Zealand actor, best known for his roles on the ABC medical drama Off the Map as Dr. Ben Keeton, the ABC medical drama Grey's Anatomy as Dr. Nathan Riggs, and for his performance as Noah Clay in the critically lauded 2002 horror film The Ring, while remaining known in his home country for his teenage role as Stuart Neilson in the soap opera Shortland Street . </P> <P> Martin was born in Auckland, New Zealand, and began acting at the age of thirteen, appearing in Strangers, a local television production . He attended Birkenhead Primary and Westlake Boys High schools . </P>

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