How to include test case owner name in the testng report

I have a requirement where in I want to customize my testng report to show the test case owner's name in the report.I have a couple of .csv files. I read these files one by one and execute sequentially using data provider.These csv files belong to multiple users.Each excel contains a separate coulumn specifying the user name.I fetch this username and set as an attribute using ITestContext .but when I fetch this attribute I am getting null value in the report.If Any body worked on this earlier please provide your inputs