Allison Cameron works in the ER. She's much happier there than she was as a member of House's team, though she returns to the latter early in season six.
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Cameron pleads with House not to ask a patient to essentially kill himself in this scene from "Simple Explanation." The main storyline of the hour, however, was Kutner's suicide.
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Here's a shot of Chase and Cameron from season three of House. They haven't exactly received a lot of screen time since then.
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Cameron took over Cuddy's job for the episode titled "Big Baby." This change didn't last long, however.
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On House, Dr. Cameron is often the voice of reason. She's played by actress Jennifer Morrison.
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House Quotes

You know another really good business? Teeny tiny baby coffins. You can get them in frog green or fire engine red. Really. The antibodies in yummy mummy only protect the kid for six months, which is why these companies think they can gouge you. They think that you'll spend whatever they ask to keep your kid alive. Want to change things? Prove them wrong. A few hundred parents like you decide they'd rather let their kid die than cough up forty bucks for a vaccination, believe me, prices will drop really fast.

House

You're an ass!

Dr. Adams