For decades now, Missy Yager has been an American actress who has seen the business change around her more than once. The career now covers more than 31 years. For much of the audience, Missy Yager is Mrs. Gelbman from 'Happy Death Day', whatever else the credits say. 'Manchester by the Sea' rounds out the better-known part of the filmography. The first credits arrived long before the title most people know. If the filmography has a home genre, it is comedy.