Omar Grant is an A&R executive at Roc Nation, he was the A&R on "Unapologetic" :
Basically when a songwriter/producer send a song to Roc Nation, Omar Grant (and Ty Ty, I think?) listen to the song(s), and when they feel like Rihanna could like it they play it to her.
I wouldn't mind if Rih does songs like this..
This was honestly one of my fave songs that was released last year.. (too bad the album sucked tho) https://www.youtube.com/watch?v=BfgoiYu9EUE