Uber hires David Plouffe, ex-assistant...

Uber hires David Plouffe, ex-assistant to President Barack Obama, as senior vice president-policy and strategy, starting late next month … Sinclair promotes Mike Kralec to vice president-data systems and information technology services, new post … Sprint hires Jeff Silva, ex-Medley Global Advisors, as manager-public affairs, succeeding John Taylor, who had left for SpaceX (CD May 9 p23) … Riverbed Technology hires Paul Mountford, ex-Sentillian, as senior vice president and chief sales officer … Imperva, data center security provider, names Anthony Bettencourt, ex-Coverity, as president and CEO and he joins board; ex-CEO Shlomo Kramer remains chairman and also is chief strategy officer.

Ex-Microsoft CEO Steve Ballmer steps down from its board … Named to keynote Society of Motion Picture and TV Engineers Annual Technical Conference & Exhibition Oct. 20-23 in Hollywood: Chris Fetner, Netflix director-global content partners operations; Mark Aitken, Sinclair Broadcast Group vice president-advanced technology; Darcy Antonellis, Vubiquity CEO … Lobbyist registrations: American Medical Technologists, Holland & Knight, effective July 2 … FlexTech Alliance, a nonprofit electronics industry consortium, Wiley Rein, effective July 21 … Raytheon, O'Brien Gentry, effective Aug. 11.