<Tr> <Th> Nationality </Th> <Td> American </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Short story </Td> </Tr> <P> William Sydney Porter (September 11, 1862--June 5, 1910), known by his pen name O. Henry, was an American short story writer . His stories are known for their surprise endings . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table>

What is the real name of o henry