The pair were previously with WME, where they've served as partners and co-heads of hip-hop and R&B since 2021.
Zimmer will continue to serve on UTA's board, which will still be led by Paul Wachter.
The Latin music veteran joins the agency to bolster the agency’s leadership in the global Latin music market.
The agents discuss country’s surging popularity, Christian music’s big growth and the legacy of Toby Keith: "[He] was fearlessly unapologetic."
Roback will run operations, strategy, technology and growth for the agency.
The Mexican singer-songwriter most recently won a Grammy for her latest album, De Todas Las Flores.
The agency will rep the Australian icon for her live and acting endeavors.
The pop icon kicked off her latest Las Vegas residency on Dec. 30.
The husband-and-wife Americana mainstays are nominated for vocal duo of the year at the upcoming CMA Awards.
The "Rich Men North of Richmond" chart-topper will be repped by UTA's team in Nashville.
