def _clean_author(author):
    """Clean the Author field of some unnecessary annotations."""
    author = author.replace('author', '').replace(' :', ':').split('/')[0
        ].split(';')[0]
    if '(' in author:
        author = author.split(')')[0] + ')'
    if '-' in author:
        author = author.split('-')[0][:-4]
    return author.strip(':.,; ')
