Richmond, Va.-based specialty insurer Markel Corp. announced the promotion today of Britt Glisson to chief administrative officer.

Prior to his promotion Mr. Glisson served as president/chief operating officer of Markel Insurance Company, a post he has held since 1996. He has worked at Markel since 1990, first as chief financial officer and later as president and chief operating officer of Essex Insurance Company.

The company said the new CAO will be responsible for assuring efficient, cost-effective operations for Markel Corp. in North America.

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