Professor Hager's works are numerous, including Interaction: How to Teach English as a Second Language, Information Technology: scavandagetoday of C Tomorrow and Excell》ingincfinance, BusinesscDrivencTechnology, management information system in the information age, I-Series series, etc. He also published a large number of papers in many magazines. Professor Hager often consults with the federal government, such as office personnel management. U.s. environmental protection agency. Social Security Administration and National Aeronautics and Space Administration (NASA).