I was participating in a workshop with the late Paul Sills many years ago. You don’t likely know his name, but Sills is one of the founders of The Second City in Chicago — the group that is known for sketch and improvisational comedy and is the birthplace of such stars as Bill Murray, Gilda Radner and Dan Aykroyd. Improvisation is a skill that is becoming widely recognized as an important tool for communication in the business world, and I was eager to learn from one of the masters. Sills…