John Skipper resigned as president of ESPN and co-chairman of the Disney Media Networks today, citing substance abuse issues: “Today I have resigned from my duties as President of ESPN,” Skipper said in a statement. “I have had a wonderful career at the Walt Disney Company and am grateful for the many opportunities and friendships…  I have struggled for many years with a substance addiction. I have decided that the most important thing I can do right now is to take care of my problem.