<Tr> <Td> </Td> <Td> John Adams </Td> <Td> April 21, 1789--March 4, 1797 </Td> <Td> President of the Senate </Td> </Tr> <Tr> <Td> </Td> <Td> Thomas Jefferson </Td> <Td> March 4, 1797--March 4, 1801 </Td> <Td> President of the Senate </Td> </Tr> <Tr> <Td> </Td> <Td> Aaron Burr </Td> <Td> March 4, 1801--March 4, 1805 </Td> <Td> President of the Senate </Td> </Tr> <Tr> <Td> </Td> <Td> George Clinton </Td> <Td> March 4, 1805--April 20, 1812 </Td> <Td> President of the Senate </Td> </Tr>

Who are the presiding officers of the senate