AST SpaceMobile to appoint AT&T Head-Network Chris Sambar to its board as part of new AT&T/AST commercial agreement to bring first space-based broadband network direct to “everyday” cellphones ... SIP Forum elects Iconectiv Chief Technology Officer Steve Tang to its board ... National CineMedia taps former PHD Media U.S. CEO Catherine Sullivan, also ex-Omnicom Media Group, as president-sales, marketing and partnerships ... VisualVault, cloud-based enterprise content management platform, names Deepak Vedarthan, ex-Pegasystems, vice president to lead its professional services organization ... Saviynt, provider of cloud-native identity and governance platform solutions, hires former Gartner identity and access management analyst Henrique Teixeira as senior vice president-strategy ... CSG, customer experience platform, adds ID.me Chief Financial Officer Samantha Greenberg to its board ... Red River, tech transformation company for government and enterprise customers, names Concetta Yates, ex-SS&C Blue Prism, head-data analytics and AI ... Blind Squirrel Games, videogame development studio, adds Digital Bandidos CEO Steve Escalante to its board ... AiOla, AI-powered enterprise speech recognition platform, hires former Wix, Cisco and Intel executive Alon Peleg as chief operating officer.