The Mahoney Prize recognizes an outstanding article in the history of computing and information technology, broadly conceived. The Mahoney Prize commemorates the late Princeton scholar Michael S. Mahoney, whose profound contributions to the history of computing came from his many articles and book chapters. The prize consists of a $500 award and a certificate. For the 2019 prize, articles published in the preceding three years (2016, 2017, and 2018) are eligible for nomination. The Mahoney Prize is awarded by the Special Interest Group in Computers, Information, and Society (SIGCIS) and is presented during the annual meeting of our parent group, the Society for the History of Technology.