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Twitter CEO Jack Dorsey steps down, effective immediately (see 2111290038), will remain on the board until his term expires at 2022 annual meeting; board unanimously appoints Chief Technology Officer Parag Agrawal to succeed Dorsey, and names Bret Taylor its new chair, succeeding Patrick Pichette, who will remain on the board and continue as chair of its audit committee.

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Gray Television names Jennifer Rieffer, ex-Sinclair, general manager-WXIX-TV Newport, Kentucky, succeeding Debbie Bush, who moves to GM of Phoenix's KPHO-TV and KTVK; both appointments are effective on closing of Gray buying Meredith’s Local Media Group, which is expected Wednesday; Gray hires TV station leader Greg McAlister as GM-KCBD Lubbock and KLCW-TV Wolfforth, both in Texas ... Aspa Paroutsas, former FCC Office of Engineering and Technology chief of staff, joins Qualcomm as vice president-federal regulatory affairs.

Walmart Executive Vice President-Chief Financial Officer Brett Biggs to depart to pursue new opportunities in the “for-profit and non-profit sectors,” will remain in his current role until successor is named next year, then becomes associate to support transition, leaving Jan. 31, 2023 ... Tech executive search firm Daversa Partners promotes Joe Patalano to managing director ... FourKites, supply chain visibility platform, hires Uber Freight’s Oleksii Kosenko as director-carrier network operations, Europe, the Middle East and Africa ... Cloud network provider Fastly taps Google Cloud’s Lakshmi Sharma, also ex-Target, as chief product officer.