Edward Irving Wortis, better known by the pen name Avi, is an American author of young adult and children's literature. He won the Newbery Medal in 2003 for Crispin: The Cross of Lead, and was a runner-up in 1991 and 1992.
Excerpt from Wikipedia, available under CC BY-SA 4.0.

Crispin The Cross of Lead
2004
ISBN 9780613749657
Ragweed
2000
ISBN 9780380801671
Crispin
2002
ISBN 9780786808281
The true confessions of Charlotte Doyle
1990
ISBN 9780531084939
Nothing but the truth
1993
ISBN 9780380719075
Poppy
1995
ISBN 9780531087831
The Good Dog
2003
ISBN 9780689838255
Crispin at the Edge of the World
2007
ISBN 9780786293667