After a successful career in mathematics and computer science, receiving grants from the National Science Foundation and NASA, and being listed in Who’s Who in Computer Science and Two Thousand Notable Americans, James R. Callan turned to his first love—writing.  He has had four non-fiction books published.  He now concentrates on his favorite genre, mystery/suspense, with his sixth book releasing in 2015.

 

 

 

 

Books by James R. Callan

      

      

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