Student or Learner
The French chef, who has been employed for nine years and travels with the designer wherever he goes.
Can 'has been employed' go with the duration 'for nine years' ?
Thank you in advance.
Yes, that's fine. But your sentence is not good in terms of parallelism. I would not "and" together "has been" with the present tense "travels."
Remove the "and" and make it a dependent clause:
...The French chef, who has been employed for nine years, travels with...