MIDDLE ATLANTIC Merrill Lynch & Co. in New York has hired Lisa Polsky, the chief risk officer at Morgan Stanley Dean Witter, as head of client financing services in its own securities services division and a managing director.

Ms. Polsky will be responsible for building the company's integrated capabilities in prime brokerage, securities financing, and margin and collateral services.

She will start work Sept. 28 and report to Richard Dunn, president and chief executive officer of the securities services division.

Before joining Morgan Stanley Dean Witter, Ms. Polsky was in charge of the hedge fund and derivative businesses at Bankers Trust and helped build the derivatives businesses at Citibank.

Citigroup Inc. has reassigned Barbara Yastine, its chief auditor, as chief financial officer of Salomon Smith Barney and of Citi's Global Relationship Bank division.She will report to Michael Carpenter, chairman and CEO of both, and will join their operating committee. She remains a member of the Citigroup management committee.

Ms. Yastine has 13 years of banking experience at Citi and its predecessors. Before becoming chief auditor she was chief administrative officer of Citigroup's global consumer group.

Earlier she was the executive vice president of finance and insurance for CitiFinancial, the vice president of investor relations and financial planning and analysis at Travelers Group, and the director of investor relations at Primerica Corp. Ms. Yastine also held communications and investor relation jobs at W.R. Grace & Co.

Bear, Stearns & Co. has hired Jay Bullock, a managing director in First Union Securities' insurance investment banking practice, as a managing director in the financial institutions group of its own investment banking business.He will focus on the insurance industry for the New York company.

SOUTHEAST First Union Corp. of Charlotte, N.C., has promoted John L. Guy Jr. to executive director of its small-business segment.He will manage the small-business banking division and will remain president of First Union Small Business Capital, his job since joining the company last year.

Mr. Guy had been president of Heller Financial's Small Business Administration lending arm, Heller First Capital Corp., and the executive vice president of business development at Heller International.

First Union has also hired Donna Jordan-Serres, another Heller small-business specialist, as chief operating officer of western operations at First Union Small Business Capital.

She had been a senior vice president of Heller Financial's small-business finance division, managing its California, Oregon, Washington, Nevada, Colorado, and Arizona region.

Bank One Texas in Dallas has named Larry Helm, who has managed Bank One Corp.'s national energy and utilities banking group for the past two years, as head of middle-market banking for Texas, Louisiana, and Oklahoma.He succeeded Ty Miller, who was promoted to head of worldwide treasury management services at Chicago-based Bank One Corp.

Mr. Helm, 53, joined Bank One in 1989 as chairman and CEO of its Dallas region.

His 28 years of Dallas banking experience includes executive vice presidencies at the failed First City Texas, in commercial lending; and the failed InterFirst Bank Dallas, whose energy division he managed.

In his new post Mr. Helm will report to Mike Welborn, head of commercial middle-market banking at Bank One Corp.

Fiserv Inc. of Brookfield, Wis., has named Greg Green president of Fiserv CBS USA, an Orlando unit that provides e-commerce banking solutions.He succeeded John O'Malley and reports to Tom Huber, president of the Fiserv CBS Worldwide division.

Mr. Green was president for a year of Fiserv eCom Services, which focuses on Internet-related products and services.

Earlier he had worked five years at Fiserve's CUSA Technologies, a credit union processing operation in Salt Lake City, rising to an executive vice presidency.

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