Who played the CDC scientist in the last 2 episodes of The Walking Dead?

I was watching the Walking Dead on AMC and the CDC scientist at the end looked like truman's best friend from the Truman Show (Noah Emmerich). I looked it up to see if I was right and I saw that he was listed as the actor but also a guy named stefan brogren. I was wondering which guy was the right one. Just curiousWho played the CDC scientist in the last 2 episodes of The Walking Dead?
Noah Emmerich



http://en.wikipedia.org/wiki/Noah_Emmeri鈥?/a>

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