Boris' Man To Help David Cameron
Lynton Crosby is credited with helping Mr. Johnson become one of the most popular Conservative politicians.
Many Tory MPs think he is one of the few strategists who can actually help them win the next election.
It's thought Lynton Crosby was initially reluntant to join the Downing Street team and will initially work part time until the run up to the General Election.
And according to a poll in today's Independent On Sunday the Conservatives do need some help as Labour have a 12 point lead.