Usually when a magazine hires a new Photography Director the first thing that happens is all the photographers are fired. There’s no actual firing because the photographers are all freelancers so there’s usually a transition where the previous Photo Editors shoots are cycled through the system and then new shoots are commissioned with entirely different photographers.
It’s not unusual for a few trusted photographers that align with the Photo Editor’s aesthetic to travel from job to job with them. Also, the Creative Director and Editor will have some favorites and depending on the dynamic at the publication those will find their way into the mix. Nothing really unusual here just the life cycle of the photo industry where everyone thinks they have the photographic solutions to whatever maybe ailing a publication at that particular moment in time (newsstand is down, advertising is down, we need a more upscale audience, we need more upscale advertisers, readers don’t send us letters).
A very different more difficult scenario occurs when a magazine gets a new Creative Director or Editor or both and you have to fire all the photographers you’ve established good working relationships with including all your goto’s. The Editor and/or Creative Director will have had to deliver a critique of the magazine to whomever is doing the hiring and I’ll guarantee that somewhere in that critique will be a discussion of the photography and how it can be changed to fix whatever ails the magazine. My advice to Photo Editors in this situation is to fire everyone and start over. You can bring in some of your favorites but only after you fire them first to show your willingness to recast the photographic DNA of your publication.
Of course, these scenarios present excellent opportunities for photographers with a good sense of timing to get themselves inserted into the regular rotation.