We've never heard of him either. Natalie Portman has been spending a lot of time with Devendra Banhart, who is a folk-rock singer-songwriter. That's occupation takes a lot of hyphening.
They were seen arm in arm yesterday walking through the West Village in NYC. Not only that, but Banhart's song "There's Always Something Happening" appears on a FINCA benefit compilation put together by Natalie on iTunes.
Nat will star in his upcoming video for Carmensita, which they just shot over the weekend. She always does have interesting taste in men, so this shouldn't surprise anyone.