To Live Again
From Wikipedia, the free encyclopedia
To Live Again is a science fiction novel by Robert Silverberg.
The book describes a world where all great scientists, economists, thinkers, builders and so on can store a "backup" of their personality (if they can afford the expansive procedure). Most of those who can afford it record their personality once every 6 months.
These personalities can then be transplanted (upon the person's actual death) to other people, "living" alongside with the Host, providing him or her with a new insight on life, and on their field of expertise.