McKesson Corporation (NYSE: MCK) today announced that Mark Walchirk has been named president, McKesson U.S. Pharmaceutical, effective immediately. Walchirk, who was most recently chief operating officer of McKesson Specialty Health, has held numerous leadership roles at McKesson for the last 11 years, including chief operating officer of McKesson U.S. Pharmaceutical. Walchirk succeeds Brian Tyler, who was recently appointed executive vice president of corporate strategy and business development, McKesson Corporation. Walchirk will report to Paul Julian, executive vice president and group president, McKesson Corporation. He will oversee McKesson’s largest business, which supplies branded, generic and over-the-counter pharmaceuticals and value-added business, clinical and connectivity solutions to more than 40,000 customers, including retail chains, independent retail pharmacies, hospitals, health systems, integrated delivery networks and long-term care providers. “With past roles as chief operating officer of McKesson U.S. Pharmaceutical and McKesson Specialty Health, Mark Walchirk has deep leadership experience in our pharmaceutical distribution business and a proven track record of delivering results for our customers,” said Paul Julian, executive vice president and group president, McKesson Corporation. “Mark’s significant experience coupled with his commitment to operational excellence and our customers’ success make him the ideal choice to lead McKesson U.S. Pharmaceutical.” Walchirk joined McKesson in 2001 and spent more than eight years in progressive leadership roles within McKesson’s U.S. Pharmaceutical business before being appointed president of McKesson Specialty Care Solutions in 2009. He led McKesson’s integration of US Oncology and assumed the role of chief operating officer for the newly combined organization, McKesson Specialty Health. In this role, he helped lead the business to record growth and introduce new solutions that empower the community patient care delivery system. As senior vice president and chief operating officer of McKesson U.S. Pharmaceutical, Walchirk led the integration of regional distributors D&K Healthcare and McQueary Bros., contributed to the dramatic growth of McKesson’s Health Mart franchise, led the expansion of McKesson’s pharmaceutical distribution business in the institutional market, and guided McKesson to industry-leading levels of accuracy and efficiency across the company’s nationwide distribution network.