<Tr> <Th> </Th> <Td> Jim Griffiths </Td> <Td> 4 August 1945 </Td> <Td> 28 February 1950 </Td> <Td> Labour </Td> <Td> </Td> <Td> Clement Attlee </Td> </Tr> <Tr> <Th> </Th> <Td> Edith Summerskill </Td> <Td> 28 February 1950 </Td> <Td> 26 October 1951 </Td> <Td> Labour </Td> </Tr> <Tr> <Th> </Th> <Td> Osbert Peake </Td> <Td> 31 October 1951 </Td> <Td> 3 September 1953 </Td> <Td> Conservative </Td> <Td> </Td> <Td> Sir Winston Churchill </Td> </Tr> <P> Posts of Minister of Pensions and Minister of National Insurance merged in 1953 . </P>

What does the secretary of state for work and pensions do