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Dr. Cox is the senior attending physician at Sacred Heart Hospital and Residency Director for the hospital. In a 2003 episode, it is established that he is 40 years old, which probably places his birth somewhere around 1963. He is the sarcastic, bitter mentor of John "J.D." Dorian, the show's main character. Dr. Cox routinely rants at and belittles J.D., though his apparently rough treatment of J.D. is intended as conditioning for the rigors and horrors of hospital life, as well as an outlet for Cox's frustration in his life. It is hinted that he is secretly proud of J.D. and thinks he has the potential to become a great doctor.

(wikipedia.org)