Current President Tim Mikolajewski to Retire
BOSTON (Oct. 17, 2025) – Liberty Mutual Insurance today announced that Nate Zangerle has been named president, Global Surety, effective Jan. 1, 2026. Zangerle will report directly to Neeti Bhalla Johnson, president, Global Risk Solutions (GRS), and will lead strategy and growth for the Global Surety business.
Zangerle’s new role takes effect following the retirement of current Global Surety President Tim Mikolajewski on Dec. 31, 2025. With knowledge stemming from over 40 years in insurance, Mikolajewski will remain with Liberty Mutual in a strategic role to support Zangerle’s transition and shape GRS’ newly launched infrastructure practice.
“Global Surety is on the verge of an exciting new chapter, one that both Tim and Nate have been integral in working toward.” said Bhalla Johnson. “Tim has not only contributed to our business results, but he has helped shape the surety industry through his leadership, innovation, and unwavering commitment to clients and colleagues. Under Nate’s leadership as CUO, Liberty Mutual Surety has grown from a US-only business to a global product line with operations in 20 countries. I’m confident that with Nate’s continued stewardship and Tim’s ongoing support, Global Surety is poised for long-term success.”
Zangerle is currently serving as both GRS Chief Underwriting Officer, Global Surety, and Credit Global Product Leader. In these roles he has shaped underwriting and reinsurance strategies, established risk appetite and operating plans, and chaired the Credit Global Product Board (CGPB), which sets priorities and protocols for GRS’s credit product lines.
Zangerle has been with Liberty Mutual since 1998, holding various underwriting roles including CUO, Specialty, and Chief Operating Officer, Global Risks.
He holds a bachelor’s degree in economics and German from Denison University. He has participated in industry organizations including the Associated General Contractors of America, the Construction Financial Management Association, the National Association of Surety Bond Producers, and the Surety & Fidelity Association of America.
“I’m honored to lead Global Surety and energized by the opportunities ahead,” said Zangerle. “We have a strong foundation — built on deep expertise, trusted relationships and a commitment to innovation — and I look forward to building on that momentum. I’m also grateful for Tim’s leadership and his continued support during this transition.”
Mikolajewski joined Liberty Mutual in 2008 upon the company’s acquisition of Safeco Insurance, for which he led the surety business. He has since led Liberty’s growth to become the number one US and global surety provider.
“Thinking back on more than 40 years in the surety industry, I’m proud of the global surety business we at Liberty Mutual have built together,” said Mikolajewski. “I’ve enjoyed watching the development of talent in our organization, pushing innovative thinking leading to broader market opportunities, and practical uses of technology and AI to make our work better. I remain incredibly optimistic about the market opportunities ahead and I’m excited to support Nate as he leads the business into its next chapter.”
