I'm not a doctor, but I'll soon play one on TV: Rachel DiPillo went from 17 year old patient to a doctor in just 2 years. As of 2015, she plays main cast member rookie Doctor Sarah Reese on Chicago Med (2015). Similarly, Jeananne Goossen went from a lab tech to a doctor in just a year. She played main cast member ER Doctor Krista Bell-Hart on The Night Shift (2014) in 2014-2015. In contrast to these two, Kelly McCreary went on to play another main cast member Doctor in Grey's Anatomy (2005) beginning in 2014.