What is Andy's official job in prison and with whom does he work How long does he hold this job What does he accomplish?

In prison, Andy Dufresne works as a prison librarian and later as the head of the library. He holds this job for nearly 19 years. During his time in this role, he significantly expands the library's collection and improves its facilities, ultimately providing valuable educational resources to inmates. His efforts not only enhance the lives of his fellow prisoners but also earn him respect and influence within the prison system.