Career
Sergison became a clerk in one of the Royal Naval dockyards in 1671 and by 1685 was a principal officer and commissioner of the Royal Navy. In 1693 he occupied Cuckfield Place House (Now Cuckfield Park) in Sussex which he later purchased from the Bowyer family. He lived at Cuckfield Place until his death
He held the seat until 1702.
Sergison continued to work in the Admiralty as Clerk of the Accounts until his retirement in 1719.
He built a large collection of papers relating to Admiralty orders to the Navy Board between 1603 and 1717. These papers have subsequently been published.
Sergison died without issue at Cuckfield aged 77 and was buried at Holy Trinity Church. His House, Cuckfield Park, stayed within the Sergison Family, until the early 1970s.
