The group, which focuses on the London Docklands area, has appointed Timmons to work with the existing in-house press office function and manage the external agency.
She said there are no plans to review the PR work handled by B-P.
Timmons reports to Canary Wharf Group chief executive George Iacobescu and financial MD Peter Anderson.
She refused to rule out looking at taking on additional in-house support, suggesting that if the right people were available they could be hired.
Timmons, who has worked at B-P for the past eight years, said the opportunity with Canary Wharf Group was 'too good to turn down'.
Earlier this month it emerged that the group was looking to develop major office schemes beyond its traditional Docklands base.
With the original 15.7 million square-feet project expected to be completed within three years, the firm is looking at developing in other areas of London, or outside the capital.