Tom is President of Great Lakes Lighthouse Research in Chicago, Illinois where he specializes in research on the technical aspects of lighthouses and lighthouse illumination.
Mr. Tag worked for NCR Corporation for 33 years where he managed the development of the maintenance planning and resource planning cost analysis tools and at AT&T Corporation, where he managed various research and development groups responsible for the Support Sentinel call tracking system.
For the last twenty-two years Tom has devoted his efforts to lighthouses. He has written four lighthouse books and numerous technical articles on lighthouse illumination. He serves as a member of the Board of Directors and as the Technical Advisor to the United States Lighthouse Society, is Chairman of the American Lighthouse Council Artifact Committee, is a member of the Optics Work Group of the World Lighthouse Society, has acted as a consultant for maritime museums, and made numerous presentations about lighthouse illumination and research to various groups.