Thanks for correcting my error. Goodman Theatre, of course, has done three O'Neill plays in the last 15 years. Besides Ah, Wilderness! in 2017, they did Desire Under the Elms in '09 and The Iceman Cometh with Nathan Lane and Brian Dennehy in '12.
Steppenwolf did A Moon for the Misbegotten in 1983. I can't recall them doing any O'Neill play since then.