Walmart Inc. has named an in-house antitrust veteran to fill its newly created chief antitrust counsel position, about a month after StarKist Co. agreed to a $20.5 million settlement with the big box retailer to resolve antitrust claims stemming from a price-fixing conspiracy.

Suzanne Wachsstock will join Walmart on March 4 from American Express Co., where she built the company’s global antitrust and trade association compliance program during her nearly 12-year tenure as vice president and antitrust counsel there, according to her LinkedIn profile and an email from a Walmart spokesperson. In her new role, Wachsstock, who will be based in Walmart’s Washington, D.C., office, will lead all of its antitrust matters globally, the email said, adding that, “as Walmart’s business continues to evolve, we are always evaluating where we can acquire talent to support the business.”