<Tr> <Td_colspan="2"> Seal of the United States Department of State </Td> </Tr> <Tr> <Td_colspan="2"> United States ambassador flag </Td> </Tr> <Tr> <Td_colspan="2"> Incumbent Woody Johnson since August 29, 2017 </Td> </Tr> <Tr> <Td_colspan="2"> U.S. Department of State Embassy of the United States, London </Td> </Tr>

Who is the american ambassador to the uk