My wife and I also very much enjoy and admire Martha Greenhouse.  We first noticed her on two of the most hilarious episodes of "Car 54 Where Are You" where she plays Lucille's sister, Rose, opposite the very funny Carl Ballantine who plays her husband. She also has a tiny part in one of the earlier episodes of Route 66.  She had a wonderful voice and could do comedy as well as drama quite well. We assume that she must have done a lot of theater. We wish we knew more about her. 