National Data Corp. has hired Robert L. Walker as chief financial officer.

Mr. Walker had been CFO of Providian Corp. in Louisville, Ky., which recently spun off its credit card subsidiary, Providian Financial Corp., in a deal associated with the acquisition of the rest of the insurance holding company by Aegon of the Netherlands.

Credit card processing forms a significant part of the payment systems portion of National Data's business. The company is also an information services provider to the health-care industry.

"We felt that we needed an exceptional person with the vision, energy, and team spirit to help formulate and execute our future strategies. Bob brings those qualities to NDC," said Robert A. Yellowlees, the Atlanta- based company's chairman and chief executive officer.

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