What was the previous Receiver's job with Jonas in The Giver?

In this book, the previous Receiver of Memory has to give
all of his memories to Jonas.  He is also supposed to teach Jonas how to deal with
having all these new memories and how to use them to help the community. Jonas asks the
previous Receiver what he should call him.  The previous Receiver decides that his job
should now be described as the Giver of Memory.  This is where the title of the book
comes from.

Much of the second part of the book is devoted
to "watching" as the Giver gives Jonas memories and these memories change Jonas's way of
thinking.