Gerald A. "Gerry" Dunn, 65, who as the longtime controller and a vice president of DynCorp was a prime proponent of a successful management-takeover bid in the 1980s at the services contracting and information-technology firm, died Sept. 6 at Inova Fairfax Hospital in Falls Church of acute leukemia.

Mr. Dunn, who lived in Annandale, had been with the company, now based in Reston, since 1962, rising to controller in 1967 and then becoming a vice president in 1973. During his tenure as controller, he saw what was then known as Dynalectron rise in annual revenues from $52 million to more than $1 billion by the time he retired in 1997. The company provides services including aircraft and computer maintenance, almost entirely for the government.

In the mid-1980s, when the firm was renamed DynCorp, Mr. Dunn and his peers were part of a much-publicized push to prevent a hostile takeover by investor Victor Posner as well as a separate internal bid by then-Chairman Jorge Carnicero. Mr. Dunn, among other managers, made the company private, spurring a stock-ownership plan for its employees. But the deal also resulted in the divestiture of nonessential parts of the business as the new owners became burdened with a $300 million debt.

But by the early 1990s, the company began buying high-tech businesses and now has $1.2 billion in annual revenue, making DynCorp the fifth-largest privately held company in the region.

Mr. Dunn worked briefly as an accountant at other commercial firms before coming to DynCorp's Fort Worth office in 1962 as an accounting manager. He transferred to its Washington area office in 1964 as an internal audit manager.

Mr. Dunn grew up in Monroe, N.Y. After graduation in 1955 from Pennsylvania State University with a bachelor's degree in accounting, Mr. Dunn spent three years as an officer on the Air Force auditor general's staff.

His marriage to Sandra Dunn ended in divorce.

Survivors include a companion of seven years, Valerie Vahouny of Annandale; five children from his marriage, Thomas of Gaithersburg, Daniel of Arlington, William of Newtown, Pa., Leslie McAlister of Alexandria and Cindy Kelley of Locust Grove, Va.; a brother; and seven grandchildren.