Fidelity Investments of Boston recently lost the services of Ivar Wold, who led the firm's web site and e-commerce program, and it may be difficult for the firm to find someone of his caliber to replace him.

Wold left Fidelity last month after four years to become senior vice president and chief technology officer of Essential.com of Burlington, Mass., which describes itself as "the Web's first energy and communications superstore." The appointment was announced Aug. 31. Previously, Wold had been senior vice president of Fidelity Investments' retail electronic commerce. Fidelity does not have a replacement for Wold yet, said Jim Griffin, a company spokesperson.

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