NEW YORK (WBTW) — Shake Shack founder Danny Meyer told CNBC his Union Square Hospitality Group restaurants will require the COVID-19 vaccine for employees and customers.

Beginning Sept. 7, customers and employees at any Union Square Hospitality Group restaurant will have to show proof of being fully vaccinated against COVID-19. Union Square Hospitality Group owns several restaurants in New York City and Washington, D.C. including Gramercy Tavern, Manhatta, and Union Square Cafe.

He told CNBC a majority of his workers are already vaccinated.

“This is the most logical thing I’ve ever seen,” he told CNBC. “I’m not a scientist, but I know how to read data and what I see is that this is a crisis of people who have not been vaccinated, and I feel a strong responsibility, on our part as business leaders, to take care of our team and our guests, and that’s what we’re doing.”

Meyer told CNBC that Shake Shack will make its own decision about vaccines at a later time.