<Tr> <Td> Caspar W. Weinberger </Td> <Td> February 12, 1973--August 8, 1975 </Td> </Tr> <Tr> <Td> Forrest David Mathews </Td> <Td> August 8, 1975--January 20, 1977 </Td> </Tr> <Tr> <Td> Joseph A. Califano Jr . </Td> <Td> January 20, 1977--August 3, 1979 </Td> </Tr> <Tr> <Td> Patricia Roberts Harris </Td> <Td> August 3, 1979--May 4, 1980 </Td> </Tr>

Dhhs is the largest department in the us federal government