Lockton Names Nick Serrault U.S. Chief Operating Officer

Mark Kuonen to Lead People Solutions Operations in Texas and Louisiana 

KANSAS CITY, June 26, 2025 /PRNewswire/ -- Lockton, the world's largest privately held independent insurance brokerage, has appointed Nick Serrault as Chief Operating Officer for its U.S. operations. Serrault will report to Tim Ryan, Lockton's U.S. President. 

Serrault brings nearly 20 years of experience, including nearly a decade of leadership experience at Lockton, most recently serving as COO of Lockton Dunning, the firm's People Solutions business in Texas and Louisiana. In that role, he led the regional team through a period of consistent double-digit growth and helped position the business for long-term scalability. 

"Nick is a trusted leader with a strong track record of success and I'm excited to partner with him," said Ryan. "He's helped one of our largest and most innovative People Solutions operations thrive—and now he'll bring that same focus and impact at a national level." 

When Serrault transitions into his new role, he will remain based in Texas. 

"Working with the Lockton Dunning team has been one of the highlights of my career," Serrault said. "We're building something strong—a business with momentum, a culture of collaboration, and a strategy that works. I'm excited to carry that same mindset to our broader U.S. operations and work alongside the U.S. leadership team." 

As Serrault steps into the national COO role, Lockton has promoted Mark Kuonen to succeed him. Based in Dallas, Kuonen will oversee operations and business development for the region, including Dallas, Plano, Houston, Fort Worth, San Antonio, Austin, New Orleans, and Baton Rouge. 

Kuonen has been with Lockton for 18 years and most recently served as Executive Vice President and Core Health & Welfare Practice Leader. In that position, he led a significant restructuring effort, helping the team scale while enhancing client service and creating new opportunities for Lockton's industry-leading talent. 

"Mark has helped shape our strategy, drive our growth, and mentor the next generation of leaders," said Steve Idoux, CEO of Lockton Dunning. "He knows our business and our culture, and he's the right person to lead our operations into the future." 

"This place has been home for a long time, and I'm honored to take on this new role," said Kuonen. "We've built an incredible team and a strategy that's working, and we are well positioned for long term growth and continued success". 

About Lockton 

What makes Lockton stand apart is also what makes us better: independence. Lockton's private ownership empowers its 13,100+ Associates doing business in more than 155+ countries to focus solely on clients' risk and insurance needs. With expertise that reaches around the globe, Lockton delivers the deep understanding needed to accomplish remarkable results. For more information, visit www.lockton.com.

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SOURCE Lockton