Answer:
Jean
Step-by-step explanation:
Copyright is a legal intellectual property right, exclusively assigned to originator of a creative work - for its publish, performance, recording etc, for a fixed period of time. The creative work can be used by any other person or party, by permission of copyright owner only.
So : As per US copyright laws, Jean's copyright ends in 1988 .Until then, if other people use parts of Jean's book in their work, then they need to obtain permission from Jean