Michael O'Neal, who had been chief operating officer for the past year, takes over as president/CEO of Gemini Industries, replacing John Barrett, who is leaving the company ... Michael R. McDonnell, ex-PricewaterhouseCoopers exec, joins EchoStar Communications as chief financial officer, replacing Steven Schaver, who was named president of EchoStar International in April . Kerry Hunnewell, former Walt Disney and Universal Studios exec, joins ReplayTV as senior VP of strategy and business operations for the ReplayTV Service. In addition, Jim Hollingsworth, senior VP of sales, becomes senior VP of sales and marketing . Mark Mendelsohn named to newly created position of VP/e-marketing at GetPlugged.com . Guy L. Standing, national sales & marketing director for Princeton Graphics Systems Monitors, named sales & marketing of the Americas, for Phonex Broadband Corp. Paul Willes, team leader of L-3 Communications' DSP Components, joins Phonex as broadband engineering director . Mitchell Witten, ex-Pioneer exec, appointed product planning & design VP at Sonance, while Maryanne Palermo, formerly with Ushio America, named Sonance quality systems manager . Peter Skarzynski promoted to senior VP, wireless terminals sales and marketing division of Samsung Telecommunications America . Dr. Mircho Davidov, ex-Hughes, named Sirius Satellite Radio's senior VP/engineering. He will replace Robert Briskman, co-founder and executive VP/engineering, when Briskman retires following launch of three Sirius satellites.