'How to creator's get Email adress from a created pull request in github

I have a question about how to get the creator's email adress from a created pull request in github.

I just to implement a jenkins job, which send a email to pull request creator, if the pull request oder than 10 days.

I saw the API Github, under the response (json) of pull request I can not find any information about creator's email.

any solutions?

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