Dr. Robert "Bob Kelso" is the former Chief of Medicine of Sacred Heart on Scrubs and is played by Ken Jenkins.  Although Dr. Kelso is generally portrayed as mean-spirited and heartless, he really is just doing his job as the Chief and is looking out for the hospital's best interests.  Now retired, Dr. Kelso still hangs around the hospital and is much more human showing his softer side and ofering advice.

Kelso often refers to his obese wife Enid and his gay son Harrison, though neither have appeared on the show.

Bob Kelso Quotes

J.D.'s narration: And then we saw something amazing. Dr. Cox said something nice to Dr. Kelso.
Dr. Cox: When you were the Chief, you were a jackass and a nightmare and I hated you a great deal.
Dr. Kelso: That's a good start.

Is there one bathroom in this damn place that has toliet paper, or do I have to start carrying around a basket of leaves?!

Dr. Kelso
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Scrubs Quotes

Turk: All right, Elliot, at the presentation I was wondering, can I do the ending? Because I really love the ending of our paper.
Elliot: Do you think I'm cut out to be a doctor?
Turk: Okay, fine, you can do the ending. I just want to say, "Thanks, folks! We've been great!"
Elliot: I'm serious. Do you think this is what I really want to do?
Turk: Elliot, I don't know.
Elliot: You can tell me. I can take it.
Turk: No, Elliot, I'm saying I don't know because I really don't know. What the hell is going on here? Why have all women gone crazy?

Ah, checking Mr. Countertop's heart rate. (Slams a pack of paper on the countertop, hurting Keith's ears) Memories. Do you know that once, Dr. Cox made me give every air conditioning unit in this hospital a pap smear? The wacky thing is room 403 did have some yeast issues.

</i> J.D.