Tucker starts at the Omnicom-owned firm later this month as associate director, reporting to GA's London chief executive Fergus Wylie.
According to Wylie, Tucker's brief will be to raise the profile in Europe of its US and Middle East-based financial services clients. GA's London office has 35 staff.
Tucker joined BPPA in April 2003 as an account executive after a spell in the property sector. Clients have spanned the defence, software and property sectors.