SBA Communications announces retirement of Jason Silberstein as executive vice president-site leasing, promoting Senior Vice President-Services Donald Day to succeed him and Vice President-Site Development Services Nichole Thomas to replace Day, all effective Aug. 1 ... NAB radio board adds Jeanna Berge, president of iHeart Media in Eau Claire, Wisconsin, and Rochester, Minnesota, filling seat vacated by iHeart Media’s Joel McCrea ... Velos IoT hires Semtech’s Colin Chew, also ex-Sierra Wireless, as CEO, succeeding Graeme Millar ... DXC Technology moves board member-interim CEO Raul Fernandez, vice chairman-co-owner of Monumental Sports & Entertainment, to permanent CEO role ... S&P Global promotes Christopher Craig to interim chief financial officer, effective Feb. 12, replacing current CFO Ewout Steenbergen, departing in March ... Kansas Gov. Laura Kelly (D) taps LionHeart Cybersecurity Advisors founder John Godfrey as the state’s chief information security officer.