Produced the second biggest hit of Britney's career, and then never heard from again. Whatever happened to them?

They just didn't click with the rest of the industry, and Womanizer's longevity wasn't as much as other comparable producer debuts

I was wondering the same.

Very strange. Although, I fail to see the goodness of 'Womanizer'.
I think Britney has done so much better with other producers.