Brooke Buchanan

Brooke Buchanan, a corporate Ghostbuster of sorts, who handled communications for John McCain before rising through the ranks of the Walmart P.R. machine and, most recently, serving as the vice president of communications at the embattled blood-testing start-up Theranos. Buchanan was a formidable presence in the P.R. world. She sparred with reporters while working with McCain, and at Walmart, during a time when the retailer was under fire for the wages it paid workers, Buchanan developed a reputation among reporters for hard-charging responses.