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Hopkins physics lab gets new director

The Johns Hopkins Applied Physics Lab has chosen a 23-year APL veteran to become the institution's eighth director. Ralph D. Semmel, 53, of Columbia, is currently director of APL's Applied Information Sciences Department. He will succeed the retiring Richard T. Roca, a former AT&T executive who steps down July 1 after more than 10 years as APL director. The lab does research and development work for the Defense Department and NASA. It employs nearly 5,000 people, more than two-thirds of them scientists and engineers.

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