Wendy Kopp stepped aside as CEO of Teach for America and will devote her time to leading the new international arm of TFA, an allied organization called Teach for All.

Teach for All will bring the TFA model to nations around the world.

Here, Gary Rubinstein checks out the personae of her successors.

One he calls the “bad Wendy Kopp,” the other he calls the “good Wendy Kopp.”

Read the tweets he collected. Tweets are often more telling about a person (if he or she writes their own) than long dissertations.