Senior banker Tony Wild formally becomes a member of the Legislative Council this morning (Tuesday).
Mr Wild, who polled 16 votes in yesterday's election, will be sworn in by Deemster David Doyle.
He comfortably defeated Arbory commissioner Brian Rae in a contest for the seat made vacant following Clare Christian's election as president of Tynwald, at the July sitting.
Mr Wild, who has been head of priority services at Standard Bank, will serve as an MLC until February 2013.
The swearing-in ceremony is at a special sitting of LegCo at 9.30am.
Steam Packet sailings cancelled as strong winds and rough seas forecast
Public Health urges residents to take steps to stay well this winter
Black ice warnings issued as police report hazardous road conditions
Douglas Council opts against low-noise fireworks after review
Shadow fleet tanker seized by US once sailed under Isle of Man flag