Can you guess the profession of the two siblings?

Jacob and Andrew are brothers and both are scriptwriters for different fields. Jacob is a(playwright, screen wright or producer) and often likes to hold brainstorming sessions with his team to come up with new ideas that help him with the script. However, once he is done with the script he has no control over it because the director can change it the way he wants to. However, Andrew works differently. He is a(playwright,director, or novelist) and often acts his script out or attends rehearsals to improve his script. However, even after his script is finalized he has full authority over it because his final script seldom undergoes any changes.