Proofreaders are expected to be consistently accurate by default because they occupy the last stage of typographic production before publication. A proofreader examines the text carefully to find and correct typographical errors and mistakes in grammar, style, and spelling. They often work for publishing houses, but they may also be freelancers who work for several clients at a time. The job of a proofreader involves working closely with writers, editors, and copy editors. According to the Bureau of Labor and Statistics, the editing profession, which includes proofreaders, will increase by about 800 positions by the year 2020. Know more about proofreader here if you want to become one.