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Patterson Companies

McKesson U.S. Pharmaceutical president to depart

McKesson U.S. Pharmaceutical president to depart

ST. PAUL, Minn. — McKesson U.S. Pharmaceutical president Mark Walchirk is leaving the company to become president and chief executive officer of Patterson Companies Inc., a distributor serving the dental and animal health markets. Patterson said Tuesday that Walchirk is slated to start at the company on Nov. 20. He also will become a member