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

If I wanted to waste my breath, I would have given my wife CPR last night when she went into cardiac arrest.

Dr. Kelso

Dr. Kelso: Son, a hospital staff is like a melting pot! We all need to respect each other. Now, if you think that a specific ethnic group is loud or lazy or sneaky...
J.D.: Or ridiculously closed-minded and inappropriate...
Dr. Kelso: Exactly!... Just keep it to yourself, dammit!

Scrubs Quotes

Dr. Cox: Oh, you're gonna hang onto that?
Molly: Yeah, you know, I forgot my lunch money, and it's kielbasa day in the cafeteria. Kielbasa!

Dr. Kelso: Son, a hospital staff is like a melting pot! We all need to respect each other. Now, if you think that a specific ethnic group is loud or lazy or sneaky...
J.D.: Or ridiculously closed-minded and inappropriate...
Dr. Kelso: Exactly!... Just keep it to yourself, dammit!