Actor: Roger Rees


What we know:
Professor at Stanford, he's also Cristina's old professor and ex-boyfriend.


Key episodes:


Medical specialty:
Carido-thoracic surgeon


Relationship roller coaster:
He and Cristina dated for three years.
He proposed to her multiple times, but was rejected


Current crush:


Secret?
He asked Cristina to marry him numerous times.


Defining moments:


Characteristic quotes: