When the doors to Chicago’s Hotel EMC2 opened this past Wednesday, Leo and Cleo were ready to get to work. Decked out in their coattails, their name tags proudly on display, the two newest additions ...

I was in the elevator heading up to my room at Hotel EMC2, a boutique hotel in downtown Chicago, when one of the hotel’s most popular staff members — Leo, a robotic butler — methodically cruised on in ...