brooke buchananBrooke Buchanan, VP of corporate communications for embattled blood diagnostics company Theranos, has moved to Whole Foods Market as global VP of communications and government affairs.

Buchanan is a former communications director for Sen. John McCain (R-Ariz.) and served as national press secretary for his 2008 presidential campaign.

She exits Theranos at the company's nadir as the once-promising and heavily funded start-up faces regulatory probes and a two-year ban of its founder and CEO Elizabeth Holmes. Buchanan left Theranos in July.

At Austin-based Whole Foods, Buchanan heads PR, internal communications and government affairs. She worked in corporate communications with Williams-Sonoma, the San Francisco-based retailer, and Wal-Mart. Global PR head Kate Lowery left in November for Homeway.com.

Whole Foods announced Buchanan's hire along with its new global VP of marketing, Sonya Gafsi Oblisk of Wal-Mart, and global VP of HR, Martin Tracey of Starbucks.