How to protect “master” in github?

Question

I have a few contributors in my github project. I want to allow only one of them to \"push\" to master. And this guy is not me (the owner of the repository). Is it possible

Answer 1

Note: Protected branches and required status checks (September 3, 2015) will allow you to protect a branch

• against forced pushed
• against deletion
• against merged changes until required status checks pass

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Since March 2016, as commented by Sander below, you have User and team restrictions

Sometimes merges to a protected branch are best left to a release manager or a team of people responsible for the stability of that particular branch. Organizations can now specify which members and teams are able to push to a protected branch.