Good heavens. I have known my Evil Twin since 1990. Her name is (currently) dr. sarah-marie belcastro. She is usually a professor of mathematics at Xavier University, (currently a visiting associate professor at Smith,) and owns a home in Iowa with her two husbands. She is also an accomplished dancer.

All of which is still exactly the opposite of my life, if there is an opposite of living in Iowa.

Her personal site is at http://www.toroidalsnark.net/, if you would like to ask for verification.

Incidentally, we also have a Good Twin. (As I am also her Evil Twin. It's complicated ethical topology.)