SECAUCUS, N.J. — Former Family Dollar Stores Inc. and Walmart executive Jason Reiser has been named chief operating officer of Vitamin Shoppe Inc.

Reiser, whose appointment takes effect July 11, will have overall day-to-day responsibility for Vitamin Shoppe’s operational execution (store operations, merchandising, supply chain and information technology) and for leading those teams through implementing the company’s reinvention strategy.

Reiser joins the chain, which has more than 750 stores and a contract manufacturing business, from Dollar Tree Inc. (successor to Family Dollar), where he was most recently executive vice president and chief merchandising officer for the Family Dollar business.

“The hiring of Jason continues to strengthen our leadership team, and he will be a valuable addition to the already experienced and capable team we have assembled,” commented Vitamin Shoppe chief executive officer Colin Watts. “Jason is joining the Vitamin Shoppe at an exciting time as we continue to move ahead with implementing our strategic plan.”

Reiser has “a long-established commitment to health and wellness, extensive experience in the industry and a proven track record of consistently delivering results,” added Watts. “His combination of industry, retail, regulatory and customer knowledge uniquely positions Jason to drive the Vitamin Shoppe’s operating priorities. I am excited, along with the rest of our team, to have Jason join the Vitamin Shoppe to help lead our ongoing company reinvention initiatives and drive our ­performance.”

Reiser has more than three decades of experience in retail management, merchandising, private brand sourcing and regulatory management as well as being trained as a pharmacist. For the past three years, he has worked at Family Dollar (starting with the company prior to its merger with Dollar Tree), initially as senior vice president of hard lines merchandising. He was named executive vice president and chief merchandising officer in January 2014.

He began his retail career at Walmart, which he joined in 1995 as a pharmacy manager, and progressed through a series of positions of increasing responsibility, including director of regulatory affairs, vice president of operations and compliance for health and wellness, and vice president of merchandising for health and family care at Walmart and Sam’s Club.