He chose the pen name "Avi" because he wanted to be known simply as a writer, not by his given name.
Here are some of his famous books:
* The True Confessions of Charlotte Doyle
* Crispin: The Cross of Lead
* Nothing But the Truth
* Poppy
* The Man Who Was Poe
He's received numerous awards for his work, including the Newbery Medal (for "Crispin: The Cross of Lead") and the National Book Award (for "Nothing But the Truth").