Archer and White Sales Inc. v. Henry Schein Inc.

(1) Whether an arbitration agreement that identifies a set of arbitration rules to apply if there is arbitration clearly and unmistakably delegates to the arbitrator disputes about whether the parties agreed to arbitrate in the first place; and (2) whether an arbitrator or a court decides whether a nonsignatory to an arbitration agreement can enforce the arbitration agreement through equitable estoppel.