The WNET Group appoints former Verizon executive James Attwood as chairman-elect of its board of trustees for six-month term beginning in January, before he succeeds Edgar Wachenheim as chairman in June ... Goran Marby leaves as ICANN president-CEO, effective immediately; Sally Costerton, senior adviser to the president and senior vice president, becomes interim president-CEO; Marby remains available to consult with ICANN until May 23, 2024 ... Infrastructure company MasTec promotes Paul DiMarco to executive vice president-chief financial officer, effective with the March 31 retirement of current CFO George Pita ... New hires at Wowza, live videostreaming company: Michael Phillippi, ex-Canto, as chief technology officer; Mark Lockwood, former ID.me, as chief revenue officer; and Matt Thompson, ex-Emburse, as vice president-marketing ... TechTarget, purchase-intent insights company, promotes Rebecca Kitchens to president and Steve Niemiec to chief operating officer and CRO, both effective Jan. 1.