(Bloomberg) -- Gen Re promoted John Brogan to chief executive officer of an aviation unit as the reinsurer at Warren Buffett’s Berkshire Hathaway Inc. phases in a new generation of leadership.

Brogan replaces David McKay, who plans to retire in April after almost 40 years at United States Aviation Underwriters, the company said in a statement Thursday. Brogan is currently the president and chief operating officer, overseeing underwriting and claims operations.

Ajit Jain, one of Buffett’s top deputies at Berkshire, has been shuffling management at Gen Re since taking responsibility for the business this year. Tad Montross, who previously led the reinsurer, announced his departure in April, and Jain promoted Kara Raiguel to run that operation in May.

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