Ken Jeong is a real medical doctor.
With the exception of Donald Glover and Chevy Chase, the whole cast of Community (2009), including creator Dan Harmon, guest-starred on this show.
In a February 2016 interview with the New York Times, Ken Jeong said that some of the show's producers put pressure on him to cast a white actress as his wife. Jeong avoided that by casting Albert Tsai as Ken's son Dave first. "There's no way I can have a white wife if I get Albert. So I got to get an Asian daughter, an Asian wife. I was not doing it for the cause. I was doing it to reflect my family. It had to be real."
The girl (Emily) introduced in the second season as the stalker and girlfriend of Dave is played by Ken Jeong's daughter Zooey.
Ken was a practicing medical doctor in New Orleans, Louisiana.