Joanne Maguire, ex-Lockheed Martin Space Systems, and Rouzbeh Yassini-Fard, YAS Capital Partners, join Visteon board ... Cox Enterprises names Duncan O'Brien, ex-TIAA-CREF, senior vice president-general manager, corporate strategy and investments ... Former Sprint executive John Harrison joins PCIA-The Wireless Infrastructure Association as senior adviser ... Frontier Communications promotes Stephen LeVan to senior vice president-video content and delivery ... IHeartMedia promotes Jeff Tyler to Minneapolis market president ... Lobbyist Registration: NCTA, Hannegan Landau Poersch Advocacy, effective Jan. 1.