User blog comment:SibunaPL/Who is The Collector?/@comment-4842074-20120226175520

I do think it's Rufus; even without that image saying he is the Collector, eventually, I figured it was him. At one point, I thought it was Vera (she's got the scariness and creepiness, totally XD), but since she was with the Collector that night at the same time, it has to be Rufus.

...I still don't know how Rufus knew he wasn't immortal and needed more Elixir. I'm sure we'll get answers from that in the future episodes.