Washington area appointments and promotions for the week beginning March 14
Datatel of Fairfax named Toby Williams vice president of corporate development.
Beck Technology of Alexandria named Stephen Stoltz head of the new office location.
I.M. Systems Group of Rockville named Renee A. Leduc Clarke director of international environmental strategy and government affairs.
OPower of Arlington named Nancy Hersh, former managing director of business intelligence at the Corporate Executive Board, vice president of analytics.
The National Rural Telecommunications Cooperative of Herndon named Jack Harvey president and chief executive.
Geico of the District named Machell Hamlin assistant vice president.
IMC of Reston named James Fraley, former senior vice president at ReliaSource, senior director for customer relations of its health and life sciences division.
B&D Consulting of the District named Libby L. Baney, former adviser, vice president with a focus in the insurance and health industry.
Kiplinger's Personal Finance magazine of the District named Kathy Kristof contributing editor.
Engineering Services Network of Arlington named James P. Hunt vice president, director of Air Force operations.
Dougherty & Associates of Alexandria named Sarah Daniels vice president, communications practice leader.
Lockheed Martin of Bethesda named Rosalind G. Brewer to its board of directors.