Crown Castle announces CEO Jay Brown is retiring, effective Jan. 16; board member Anthony Melone to become interim CEO during a replacement search ... GlobalFoundries appoints Silicon Labs Chief Financial Officer John Hollister as CFO, effective Feb. 5; Silicon Labs announces Chief Accounting Officer Mark Mauldin will be named interim CFO when the “handover” is completed by Feb. 2, while search is underway for Hollister’s permanent replacement ... AeroVironment hires Mercury Systems’ Church Hutton, also former Sierra Nevada, as vice president-government relations ... RingCentral returns founder Vlad Shmunis to his full-time role as CEO, replacing departed Tarek Robbiati; Shmunis also remains RingCentral chairman ... Gather AI taps Kiva systems' founding engineer Andrew Hoffman as chief technology officer.
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Strava, social media platform for athletes, hires YouTube Shopping General Manager Michael Martin as its next CEO and adds him to its board, effective Jan. 2, replacing co-founder Michael Horvath, moving to executive adviser with Martin’s arrival ... BlackBerry promotes John Giamatteo, president of its cybersecurity business unit since October 2021, to CEO; Richard Lynch, interim CEO since Nov. 4, will continue as board chair ... Valens Semiconductor, connectivity solutions provider, names Scopio Labs’ Guy Nathanzon CFO, effective March 10; interim CFO Yael Rozenberg Haine will return to her role as vice president-finance with Nathanzon’s arrival ... TechNet hires PF Consulting’s Patrick Fleming, also ex-Republican House aide, as director-federal policy and external affairs … Summit Ridge Group appoints to its valuation and technology teams Kevin McElroy, ex-Crowe, as director, and Yagnik Mehta, ex-New York University Stern School of Business, as analyst ... HYCU, data protection service, names Angela Heindl-Schober, from Vectra AI, senior vice president-global marketing.