GameStop welcomes new Chief Executive Officer Michael K. Mauler   GRAPEVINE, Texas, 2018-Feb-08 — /EPR Retail News/ — Dan DeMatteo, Executive Chairman of GameStop Corp. (NYSE:GME), on behalf of the Board of Directors, announced today (Feb. 06, 2018) that Michael K. Mauler has been appointed as the Company’s new Chief Executive Officer, effective immediately. Mr. Mauler will also join GameStop’s…