John O'Connor can refer to various individuals across different fields, including literature, journalism, and other professions. Without a specific context, it's hard to provide an accurate description. If you're referring to John O'Connor as an author, he may be known for a particular book, article, or research area. For instance, there's John O'Connor who co-wrote the book "A G-Man's Life" with famous FBI agent Mark Felt, also known as "Deep Throat," who provided crucial information during the Watergate scandal. In literature, there might be authors with that name who have written on a variety of topics or in different genres. Please provide more details or specify the works or background of the John O'Connor in question for a more precise description.