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David M. Mihelcic, former chief engineer for the Global Information Grid-Bandwidth Expansion program, has been named chief technology officer for the Defense Information Systems Agency.

He replaces Dawn Meyerriecks, who left DISA in July to accept a position with America Online Inc.

Mihelcic is credited with defining the GIG-BE architecture and networking technologies that form the infrastructure's foundation. He also has served as chief executive engineer for network services, chief of the Center for Defense Information System Network Evolution and primary technical adviser to the principal director for network services.

Mihelcic will be responsible for defining DISA's overarching technical strategy for synchronizing programs and services with the Defense Department's network-centric transformation.

Richard Brozen, who has been a special adviser on the government's enterprise architecture efforts since April last year, has completed his stint and returned to NASA. Brozen had been NASA's deputy CIO for management before his detail to the Office of Management and Budget. He'll return to the NASA CIO's office, though his specific job is not yet defined.

Carolyn Cockrell has assumed the job of acting CTO for the Housing and Urban Development Department.

Cockrell began filling in last month for Gloria Parker, now special assistant on communications and technology issues to Dennis Shea, assistant secretary for policy development and research.

An employee with HUD since 1986, Cockrell had been deputy CTO for IT operations since May 2002.

Trudi Bellardo Hahn has been named interim executive director of the National Commission on Libraries and Information Science.

Hahn is a former manager of library user education services and adjunct professor at the University of Maryland's College of Information Studies.

Thom H. Dunning Jr. is slated to become the new director of the National Center for Supercomputing Applications. Dunning is scheduled to start the job in January. His appointment needs the approval of the University of Illinois Board of Trustees; the center is based at the university's Urbana-Champaign campus.

Before his appointment, Dunning was director of the Joint Institute for Computational Sciences at Oak Ridge, Tenn., and a distinguished professor at the University of Tennessee at Knoxville.

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