Doctor Percival "Perry" Cox is a doctor at Sacred Heart in Scrubs played by John C. McGinley.  Dr. Cox keeps a rough exterior and is very sarcastic even though he's always making his decisions to best help patients.

J.D. always looks up to Cox as a mentor but he preetends to hate J.D., even though he deep down things he's a good doctor.  He is an avid sports nut and frequently is seen wearing a Detroit Red Wings jersey.

He was the interim Chief of Medicine after Dr. Kelso retired and before Dr. Maddox took over.  He is expected to take back over this season.

Perry Cox Quotes

Dr. Kelso: Sharp coat, sport.
J.D.: Oh, yeah. It's spiffy!
Dr. Cox: Shocker, Big Bob - you care more about appearances than actual-
Dr. Kelso: Better finish that thought quickly, Perry, I'm not breaking my gait.
Dr. Cox: Just saying: Substance, style, what's important, coat, not-
Dr. Kelso: Ha! Ha! Ha! Too slow!
J.D.: Think you really got through to him.
Dr. Cox stops and turns.
J.D.: Oh, my God, you hear like a bat!

Dr. Cox: No, Newbie, I have not killed. But I happen to be, as always, the exception that proves the rule. So, right about now, you gotta be asking yourself, do you think you're that good?
J.D.: Oh my God. I'm gonna kill someone.