Towse also has been tapped senior vice president. He has been CFO at Vette and at Fairchild Semiconductor.
Cal Hoagland, a principal at FLG Partners, has been named interim CFO. NeoPhotonics has hired an executive-search firm to find a permanent successor.
Allen was serving as controller and senior vice president. Before that, he was controller and chief accounting officer at Corsair Components.
Cahill has served as executive vice president of sales and marketing at Uplogix and as CFO at BreakingPoint Systems.
McDonald has been CFO at eASIC, Advanced Analogic Technologies, Monolithic Power Systems and Elantec Semiconductor.
Christl also serves as senior vice president. He has been CFO at divisions of Warnaco Group and a unit of Technicolor.