American Electric Power has named Keith Darling president of AEP River Operations LLC. Darling, 60, will oversee all managerial and operating activities related to AEP River Operations, including sales, planning and budgeting, accounting, business development, logistics, operations and maintenance. He replaces Mark Knoy, who left the company. "Keith's river operations experience is both broad and deep, and he has a unique understanding of how our river operations fit with our broader corporate strategy," said Tim Light, senior vice president – Fuels, Emissions & Logistics. Darling has served as managing director of boat operations for AEP River Operations since 2002.