UnitedOne Credit Union announced today Chief Executive Officer Kim Rooney will retire in June, concluding more than 30 years of dedicated service to the financial institution and its members. 

Rooney will be succeeded by Amy Sonnemann, currently UnitedOne’s Chief Lending Officer. 

“Amy is a remarkable leader who understands our mission at its core,” Rooney said. “Her dedication to our members has been evident since the day she joined us. I have complete confidence that UnitedOne’s future is in excellent hands under her leadership.” 

Rooney joined the credit union in 1995 as its first Marketing Director. She aided former CEO Dennis Lombard in facilitating the 2002 merger between Manitowoc Community Credit Union and First Superior Credit Union of Sheboygan. 

A strong advocate for financial education, Rooney played a pivotal role in launching the first school credit union at Monroe Elementary in 1996. The partnership between UnitedOne and the Manitowoc Public School District has since expanded to eight school branches, helping generations of students build financial literacy skills. 

Since becoming CEO in 2009, Rooney has guided UnitedOne through significant growth, increasing assets from $173 million to $329 million in 2025. Her leadership has helped strengthen the credit union’s community presence, member services and financial stability. 

“Serving our members has been one of the greatest honors of my life,” Rooney said. “I’ve had the privilege of working alongside an incredible team and witnessing firsthand how a credit union can strengthen a community when people come together with purpose and heart.” 

Sonnemann, a Manitowoc native, began her career with the credit union 29 years ago. She has held numerous roles since, including six years serving members in the credit union’s Sheboygan offices. Deeply committed to community involvement, Sonnemann volunteers with several local nonprofits and is passionate about expanding financial education initiatives. 

“UnitedOne has been an important part of my life and career,” Sonnemann said. “I’m honored to continue our mission of helping members achieve financial well-being and strengthening the communities we serve.” 

UnitedOne was recognized as No. 2 nationally in the “Best Credit Union to Work For” by American Banker. The credit union invests locally through volunteerism, financial education and partnerships with organizations that share its commitment to community betterment. 

Founded in 1938, UnitedOne Credit Union is a full-service financial institution serving everyone living or working in Manitowoc, Sheboygan, Kewaunee and Door counties. The credit union serves consumers and small to mid-sized businesses. For more information, visit www.UnitedOne.org.