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History Cop is the home page for Johnson Research Services which provides genealogical and historical research services for family historians, authors, attorneys, government agencies and media production companies.  Johnson Research Services also provides classes and lectures on conducting Chicago area genealogical and historical research as well as providing talks and presentations on Chicago historical topics to libraries, community groups and historical societies.

History Cop was founded by Ray Johnson, a life-long Chicago area resident and history buff who is a former criminal investigator.