John Holdren is the "Science Czar" for the Barack Obama administration.
While he is not exactly a household name, it is worth knowing who he is. He has had some very interesting views in the past about, among other things, population control.
Of course the Obama administration says this was all in the past and we should not hold him to his past views. This kind of like saying that a domestic terrorist committed his deeds in the past and should be excused now because he is a changed man.
Anyways, Fox did a nice little summary of his views here. Wander over and take a look.