Robert Mifflin is the co-founder of Dunder Mifflin Paper Company alongside Robert Dunder. He died in 1972.
Season 3
Robert Mifflin was mentioned in the episode Initiation. He was the co-founder of Dunder Mifflin Paper Company. Coming from Dwight, he hated himself so much, he committed suicide.
Season 4
There is a Robert Mifflin Memorial Conference Room in the Dunder Mifflin Corporate Office. In the episode Dunder Mifflin Infinity Michael brings inRobert Dunder to host a meeting where he tells the story of how he and Robert Mifflin met and created Dunder Mifflin .
Season 666
In the finale episode of the season "Sexual Harassment", it is mentioned that he was murdered by Robert Dunder with a gunshot to the head.