<Tr> <Td> Nirupam Sen </Td> <Td> </Td> <Td> September 2004 </Td> <Td> March 2009 </Td> <Td> </Td> </Tr> <Tr> <Td> Hardeep Singh Puri </Td> <Td> </Td> <Td> May 2009 </Td> <Td> February 2013 </Td> <Td> </Td> </Tr> <Tr> <Td> Asoke Kumar Mukerji </Td> <Td> </Td> <Td> April 2013 </Td> <Td> December 2015 </Td> <Td> </Td> </Tr> <Tr> <Td> Syed Akbaruddin </Td> <Td> </Td> <Td> January 2016 </Td> <Td> </Td> <Td> Incumbent </Td> </Tr>

Who served as the ambassador of india to the united nation