Robert Chase is married to Cameron on House. He was fired during season three and now works as a general surgeon.
Initially, Chase seems like a soft individual, often kissing up to House and telling the doctor whatever he wants to hear. But following his firing, Chase gained more confidence in himself and stands up for his beliefs far more often.
This was never more true than when he actually gave the wrong medicine to a brutal African dictator, ending his life in season six.
Dr. Chase: I was 15 years old when you walked out. Now you're walking back in?
Rowan: I left your mother. I didn't leave you.
Dr. Chase: (near tears) Mum was living on gin and tonics, how was I supposed to take care of her?
Rowan: She wasn't your responsibility.
Dr. Chase: I know! She was yours.
Dr. Chase: It doesn't necessarily have to be that bad. If we exclude the night terrors it could be something systemic: his liver, kidneys, something outside the brain.
House: Yes, feel free to exclude any symptom if it makes your job easier.