Lois Lowry is a a two-time Newbery Award winner. In 1990 she won for Number the Stars, a work of historical fiction set in Denmark during World War II. In 1994, she was again the Newbery winner for The Giver, which is set in an alternate (or possibly futuristic) society where one young boy, Jonas, rebels against the Elders and the system they have created to govern their world. Both books are great reads that have enjoyed popular as well as critical acclaim since publication.
Lowry is nothing if not a busy writer! Since the publication of her first book, A Summer to Die, in 1977 -- she has written over 30 children's novels. Many are funny. Some are serious. But according to Ms. Lowry, all of them deal primarily with one theme: the importance of human connections.
You can read more about Ms. Lowry at her website -- and you can check out all of her books from the San Antonio Public Library. A simple author search will provide you with a complete list.