function add_{post type in my case book}_columns($columns) {

    unset($columns['author']);

    return array_merge($columns, 

              array('publisher' => __('Publisher'),

                    'book_author' =>__( 'Book Author')));

}

add_filter('manage_book_posts_columns' , 'add_book_columns');

function add_{post type in my case book}_columns($columns) {

    unset($columns['author']);

    return array_merge($columns, 

              array('publisher' => __('Publisher'),

                    'book_author' =>__( 'Book Author')));

}

add_filter('manage_book_posts_columns' , 'add_book_columns');