Liberty Media board member Ian Gilchrist joins Sidebar board...

Liberty Media board member Ian Gilchrist joins Sidebar board … George Riedel, ex-Juniper Networks, joins Accedian Networks board …Microsoft promotes Satya Nadella to president of its server and tools business …Disney/ABC TV Group promotes Adam Sanderson to senior vice president-franchise management … Arbitron names Richard Surratt executive vice president of finance, and he will soon become chief financial officer, succeeding Sean Creamer, previously promoted … TruTV promotions to senior vice president: Robyn Hutt for original programming; and Anthony Horn for current programming and specials … Joining Insight Communications as vice presidents: Mitch Weinraub for product development; and Keely Bostock for programming and video services.