Dr. Cohn

Dr. Cohn is a neurosurgeon who operated on Derek Shepherd after his car accident.

History
Dr. Cohn was paged when the doctors operating on Derek noticed that his right pupil was blown. Dr. Cohn was at a dinner and they were told he'd be at the hospital within twenty minutes. Despite this, it took Dr. Cohn an hour and a half to arrive. When he got there, he scolded them for not getting a CT and paging him earlier. He then kicked Edie out of the room when she scolded him for not responding to his page in a timely manner. He operated on Derek's brain, but it was far too late and he was pronounced brain dead. Dr. Cohn apologized to Meredith, saying that he had long admired Derek's skill and technique.

Co-Workers
He does not seem to have much respect for his fellow doctors, even kicking Edie out of the ER when she called him out for taking 90 minutes to respond to his page.

Derek Shepherd
He told Meredith that he had long admired Derek's skill and technique, indicating professional respect.

Career
Dr. Cohn is a neurosurgeon at Dillard Medical Center. He appears to be a typical arrogant neurosurgeon, passing the blame for Derek's condition off to Edie and Paul for not getting a CT, despite him taking over an hour longer than he said he would to arrive at the hospital.