Ms. Henderson writes about the business of health and the Food and Drug Administration. (On National desk rotations, she has written about the Valerie Plame investigation, efforts to tighten America's porous border with Mexico, and efforts to expand federal funding for embryonic stem cell research.) Her articles for the Globe's Business section have covered such topics as product liability lawsuits filed against Merck & Co. after Vioxx was pulled from the market, the FDA's tougher stance on direct-to-consumer advertising, blockbuster drug approvals, conflicts of interest among FDA employees and advisers, and Congressional efforts to bolster FDA post-marketing surveillance. Prior to the Globe, her 20-year reporting career has included stints at the Washington DC bureau of The Associated Press, the Denver Post, the Seattle Times and the Miami Herald.