<Table> <Tr> <Th> No . </Th> <Th> Name </Th> <Th> Assumed position </Th> <Th> Left position </Th> <Th> Source </Th> </Tr> <Tr> <Td> </Td> <Td> Seán Mac Stíofáin </Td> <Td> December 1969 </Td> <Td> 19 November 1972 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Joe Cahill </Td> <Td> November 1972 </Td> <Td> March 1973 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Seamus Twomey (1st time) </Td> <Td> March 1973 </Td> <Td> June 1973 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Éamonn O'Doherty </Td> <Td> June 1973 </Td> <Td> June / July 1974 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Seamus Twomey (2nd time) </Td> <Td> June / July 1974 </Td> <Td> December 1977 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Gerry Adams </Td> <Td> 3 December 1977 </Td> <Td> 18 February 1978 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Martin McGuinness </Td> <Td> 1978 </Td> <Td> Autumn 1982 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Ivor Bell </Td> <Td> Autumn 1982 </Td> <Td> September 1983 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Kevin McKenna </Td> <Td> September 1983 </Td> <Td> October 1997 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Thomas "Slab" Murphy </Td> <Td> October 1997 </Td> <Td> 2005 (campaign officially ended) </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> No . </Th> <Th> Name </Th> <Th> Assumed position </Th> <Th> Left position </Th> <Th> Source </Th> </Tr> <Tr> <Td> </Td> <Td> Seán Mac Stíofáin </Td> <Td> December 1969 </Td> <Td> 19 November 1972 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Joe Cahill </Td> <Td> November 1972 </Td> <Td> March 1973 </Td> <Td> </Td> </Tr>

Who is the current leader of the irish republican army