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.

Jan Britt

Jan Britt


Senior Vice President – Retail Banking

Jan Britt joined the bank in June 2015, and has focused her efforts on staff development and leadership for our retail branches.  Prior to joining Ixonia Bank, Jan spent over 25 years at M&I Bank/BMO where her role culminated as Senior Vice President – Retail Market Manager. In that position, she provided leadership and direction for 15 branch locations with over $1.5 billion in deposits and 175 employees.

In addition to leading the retail area of the bank, Jan serves 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. Jan is actively involved in the Oconomowoc Chamber, serving as Chair of the Ambassador Committee. Additionally, she is on the Parent Advisory Board of Semester At Sea, a college study abroad program. Jan earned her Bachelors Degree in Business Administration from Mount Mary University.

Jan and her husband Bill live in Hartland, and have two adult children. In her spare time, she enjoys traveling, gardening, boating and fishing.

Carrie Rosenau, SHRM-CP

Carrie Rosenau


Senior Vice President – Chief Operations Officer

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. She was promoted to Chief Operations Officer in mid-2019. 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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