Dr. Isaac Hershberg is Karen's doctor in the episode Nice in White Satin. He was portrayed by Jack Black, who was writer Laura Kightlinger's boyfriend at the time.
He is shown to be incompetent and unprofessional, (which disconcerts Will) despite having attended Harvard. He also appears to have an incestuous relationship with his sister, Nurse Sheila.
- Jack Black was not credited for this role.
Are you ready for the Dr. Isaac Hershberg experience?
Dr. Isaac Hershberg
[CRYING] Damn you, God! Why? Damn you! Any hoozlebees. Mrs. Walker, how you feelin' today?
Dr. Isaac Hershberg, after giving bad news to a patient
If she weren't my sister, I'd be tapping that ass big time.
about Nurse Sheila