Why was Joe Keller a dynamic character in All My Sons?

Joe Keller is a dynamic character in that he shows growth and change throughout the play. In the opening, he is the family patriarch; calm, proud, a man in control of his destiny and those around him. Through a series of events, however, he begins to realize what building his business has cost him and he is conflicted. Ignoring the facts and hiding the truth for so many years he finally faces the fact that his choices cost people their lives, and he can't face these truths. In the end, he takes his own life because of the deep sense of remorse and guilt that he feels.