Executive Officers

Dan Westrope

Dan Westrope


Chairman & CEO

With over 40 years in the banking industry, Dan Westrope’s background and knowledge of banking helps lead Ixonia Bank’s professional team of bankers to meet the needs and objectives of their customers and the communities that they serve. Prior to joining Ixonia Bank, Dan held the position of President and Chief Executive Officer of National Bancshares, Inc. in Bettendorf, Iowa. Previously, he had been Executive Vice President and Chief Financial Officer of State Financial Services Corporation and State Financial Bank, both located in the Milwaukee area; and Howe Barnes Investments in Chicago, Illinois. He graduated from Western Illinois University with a Bachelor of Business Degree. 

Mark Wierman

Mark Wierman



Mark Wierman joined Ixonia Bank in September 2014 as its Chief Lending Officer and was promoted to President in December 2017. With nearly 35 years of banking experience, Mark is primarily responsible for the Bank’s commercial and consumer lending and new business development efforts, as well as overseeing the retail and operational areas of the Bank. Prior to joining Ixonia Bank, Mark held senior leadership positions with other local banks including Associated Bank and LaSalle Bank. He is a graduate of the University of Wisconsin – Whitewater, where he obtained a Bachelors degree in Business Administration – Finance.

Mark is active in several local organizations including serving on the boards of Tall Pines Conservancy, Ausblick Ski Hill, Gethsemane United Methodist Church and on the Finance Committee at the YMCA at Pabst Farms. Mark is also currently serving on the board of the Wisconsin Bankers Association. Mark and his wife Debbie reside in the Oconomowoc area and have three adult daughters and two grandchildren. In his spare time, he enjoys outdoors activities including boating, skiing, golfing and fishing.

Jeff Versluys

Jeff Versluys


Executive Vice President – Chief Operations Officer

Jeff Versluys joined Ixonia Bank in December 2005 and has led multiple areas of the bank since that time, including: Wealth Management, Marketing, Retail Operations, and Information Technology.  He has 27 years of experience in the banking industry, including Marketing and Retail leadership positions with 3 other Milwaukee area banks prior to joining Ixonia Bank. Jeff is a past Chairman of the Wisconsin Bankers Association Retail Section Board of Directors.  Prior to his career in banking, Jeff worked for Accenture doing information technology consulting.  He received his Bachelor of Business Administration degree from the University of Wisconsin – Madison with a double major in Finance and Marketing. Jeff also completed the Senior Management program at the Graduate School of Banking in 2010.

Jeff and his wife Lisa live in Menomonee Falls and have two adult children. In his free time, he enjoys golfing and outings with friends and family.

Carrie Rosenau, SHRM-CP

Carrie Rosenau


Senior Vice President – Human Resources & Training

Carrie joined Ixonia Bank in 2005, and in her 14-year career with Ixonia Bank she has served as a Customer Service Representative, a Relationship Banker, an Ixonia Wealth Management Assistant, a Branch Manager, and a Regional Manager before starting her role as Vice President of Human Resources in early 2017. Carrie is currently a member of the Society of Human Resource Management (SHRM), and has obtained her HR Certification as a Society of Human Resource Management - Certified Professional (SHRM-CP). She serves as Treasurer the Board for Jefferson County Human Resource Management Association, as well as Co-Chair of Ixonia Bank’s Women in Business Initiative Team which is focused on supporting women business owners and leaders in professional and personal growth. She received her Bachelors Degree in the Science of Education from Martin Luther College-New Ulm, Minnesota.

Carrie and her husband Andy live in Ixonia with their two children. They are members of St. Matthew’s Church and School in Oconomowoc, and enjoy outdoor activities and family trips up north during the summer.

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