In a letter addressed to Gottlieb, Warren implored him to resign from board of the Big Pharma company, writing "this kind of revolving door influence-peddling smacks of corruption."
Gottlieb, who announced his resignation last month after 23 months as FDA commissioner, told The Washington Post he would focus on drug pricing and "market failures" that lead to high costs.
Greenway Health blends smart technology with human expertise to elevate revenue cycle.
"It's hard to talk about quality and outcomes," admitted Neera Tanden of the Center for American Progress.