The flight from Seattle to Hayward, Calif., is only two hours long, to the relief of Walt Mahoney. In January, Mahoney was hired as the senior vice president of R&D for Epoch Biosciences in Washington, but will continue to work one day a week at Quantum Dot, where he’s chief scientific officer. “Coming to Seattle was due, actually, to health and my family. My parents are in the area. My mother has had some medical issues and I thought it would be nice at this time in her life to be home,” Mahoney says.