McCullough, 49, is senior vice president and senior production officer of Alabama Power, a Southern Company subsidiary that provides electricity and energy services to 1.4 million customers in the southern two-thirds of Alabama. As executive vice president of Engineering and Construction Services, he will direct the approximately 1,600 employees responsible for new generation and environmental strategy development, major project design and construction execution, technology due diligence and O&M support.McCullough joined Southern Company in 1987. He has held leadership positions at coal-fired, gas-fired and hydro-electric power plants in Georgia and Alabama, and also served as vice president and senior production officer of Gulf Power. A registered professional engineer, McCullough holds bachelor's degrees in electrical engineering and mathematics from Vanderbilt University and a master's in business administration from Auburn University. Heilbron, 41, is senior vice president and senior production officer of Southern Power, the subsidiary of Southern Company that acquires, builds, manages and owns generation assets that have been constructed for the wholesale market. As senior vice president and senior production officer of Alabama Power, he will oversee the utility's power generation functions. Heilbron joined subsidiary Georgia Power as a plant engineer in 1998 after having worked at Milliken & Company. Since joining the company, he has worked as a plant manager and in maintenance, operations and large project management. Heilbron is a graduate of Auburn University, where he received a bachelor's degree in civil/environmental engineering and a master's degree in environmental engineering. He completed a master's in business administration at Emory University. Claburn, 47, is director of Human Resources for Southern Company Operations. In her new role, she will oversee the operations of subsidiary Southern Power's more than 8,600 megawatts of electric power generation with facilities in Alabama, Florida, Georgia, Nevada, New Mexico, North Carolina and Texas, and with an additional 30 megawatts under construction in Nevada. Claburn joined Southern Company in 1987 as a student engineer in Oneonta, Ala. After graduation, she spent two and a half years at NASA in Huntsville, Ala., before rejoining Southern Company as an engineer. Since returning to the company, she has worked in engineering and construction services, system planning, plant management, fuel services and human resources. Claburn holds a bachelor's degree in electrical engineering from the University of Alabama and a master's in business administration from Samford University.