Amazon.com Inc.’s Whole Foods Market chief has been tapped to run the retail giant’s entire grocery business. Jason Buechel will become the vice president of worldwide grocery stores, Amazon retail chief Doug Herrington said in a note to employees,

Whole Foods workers in Philadelphia became the first group to unionize under the grocery store chain. The vote came months after it filed to hold a union election in November.

Jason Buechel will expand his role to oversee Amazon’s Worldwide Grocery Stores business, including Amazon Go convenience stores and Amazon Fresh physical and online stores, while also continuing to serve as Whole Foods Market CEO.

In his expanded role, Buechel will oversee Amazon's roster of grocers, including Whole Foods, Amazon Fresh, Amazon Go and other grocery partnerships, as the division looks for ways to boost revenue. He will keep his role as CEO of Austin-based Whole Foods.

Jason Buechel, who will remain the head of the specialty banner, steps into a newly created role in which he will also oversee the Amazon Fresh and Amazon Go chains.

The union's election win, which workers called "historic," tees up another organizing battle inside Amazon's workforce.

Worldwide Amazon Stores CEO Doug Herrington has revealed that Whole Foods Market (WFM) CEO Jason Buechel will take on an expanded responsibility. Buechel has been named VP of Worldwide Grocery Stores (WWGS) while maintaining his current role at Whole Foods.

Whole Foods workers in Philadelphia are voting on whether to form the first union in the Amazon-owned chain. The company is pushing back.