How does a recognized and well-known Professor help his students in getting an academic job?
This doesn't usually work that way. When your prof gets involved on your behalf, besides writing the most stellar recommendation letter they can, they're just going to pick up the phone and call if they know someone at the place you are applying. A personal recommendation beyond the usual stellar letter from someone trustworthy that you know can go a long way towards differentiating between otherwise equally viable candidates.