UScellular adds Network Wireless Solutions CEO Xavier Williams, ex-AT&T and FirstNet, to its board, effective Jan. 1, to replace departing Samuel Crowley ... FiberSense, infrastructure sensing and monitoring company, adds former Google Senior Director-Infrastructure Mark Sokol to its board as a nonexecutive director ... Semrush, online visibility management SaaS platform, names David Mason, ex-Kayak, general counsel-secretary ... Open source software company Rancher Government Solutions names Red Hat’s Tricia Fitzmaurice vice president-sales ... Data virtualization company Zetaris taps former Snowflake executive Kent Graziano as chief technical adviser.