Tom Citron is leaving Newmark Knight Frank for Colliers International’s retail practice group.

Citron, who is joining the brokerage as an executive managing director, has represented tenants like Capital One Bank, Flywheel and Swatch Group, according to a release from Colliers announcing the news.

He also reportedly advised Dunkin’ Brands on a planned expansion in Manhattan, and brokered deals for landlords like Jamestown Properties, Alchemy Properties and Nuveen.

Some of his previous deals include H&M’s leases at 4 Times Square and 589 Fifth Ave. in 2013.

“His diverse background and experience both in New York City and other major markets throughout the U.S. brings a unique perspective that will serve to strengthen our already robust retail platform,” Colliers Director of Operations for the Tri-State Region Stephen Shapiro said in release.

There has been significant tumult at the retail division of Newmark in recent months. In May, Robert Futterman, who had been serving as the chair of Newmark RKF, the retail subsidiary of the publicly traded company, was fired.

BGC and Newmark bought Futterman’s brokerage, Robert K. Futterman & Associates, last year, and the former CEO had stayed on to run the company’s retail expansion. Futterman later said he had been falsely accused.

Citron had been at Newmark since 2014, having joined the company from Cushman & Wakefield.