Which producer both created the character of Dr. Izzie Stevens and also wrote the Dr. Izzie-focused episode "Time Has Come Today"
Time Has Come Today (Grey's Anatomy):  Written by Shonda Rhimes and directed by Daniel Minahan, the episode aired on the American Broadcasting Company (ABC) in the United States on September 21, 2006. Izzie Stevens:  The character was created by series producer Shonda Rhimes, and was portrayed by actress Katherine Heigl from 2005 to 2010.
Shonda Rhimes