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Meet Our Team

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William Kallsen, CPA, CIA, CISA, CFSA, CGMA, CEO

Certified Public Accountant / Auditor

  • 34 plus years of Private and Public Accounting and Tax Experience
  • 14 plus years of Auditing
  • Graduate of Indiana Wesleyan University, BSBA in Accounting
  • Certified Internal Auditor
  • Certified Information Systems Officers
  • Certified Financial Services Auditor
  • Chartered Global Management Accountant

When Bill finds some spare time he spends it with his wife Cindy, children and grandchildren in Hinton Iowa. For a past time he enjoys following or watching all sports and wood working when time allows it. When at the office you’ll be able to tell which sports teams he favors.

Thomas Erichsen, CPA, MBA (RETIRED)

Certified Public Accountant

  • 38 plus years of private and public accounting experience
  • Graduate of University of South Dakota, MBA, Augustana College, BA - Accounting
  • Served as President for Rotary International, LeMars
  • Served as Treasurer for LeMars Community Schools Foundation
  • Served on Board of Directors for LeMars Chamber of Commerce
  • Served as State Director for Small Business Development Centers>
  • Previous Adjunct Professor at Western Iowa Tech Community College

When Tom is not in the office, he enjoys spending time on the golf course and has been found in the middle of the lake trying his luck with the fish. An avid reader, he enjoys learning new things. He anticipates the opportunities to gather his family together. They call him "Grandpa".

Melissa Matthews

Office Manager, Bookkeeping & Marketing

  • Graduate of Hamilton Business College of Cedar Rapids, IA – AA in Office Clerical
  • 30+ Years of Business Experience and Clients Relations.

Melissa resides in Terril and is familiar with the Lakes Area, which is where she grew up. She enjoys spending time with her family and spoiling her grandchildren. She also enjoys crafts, sewing and gardening. Melissa looks forward to the continuing success of the firm and is here to help you-and your business-prosper!

Bart Bonnstetter, AFSP

Senior Accountant/Payroll Specialist/Bookkeeping

  • Graduate of Buena Vista University- BA –Accounting/Business Administration.
  • 8 Years of Experience in accounting.

Bart joined Erichsen, Kallsen and Associates in 2019 at the beginning of tax season. He will be responsible for preparation of personal and business tax returns, bookkeeping and payroll services. He brings a familiar face to the firm being his family is from the Lakes region. In his time away from the office he likes to spend time outdoors from golfing, camping and boating. In the winter he enjoys bowling and getting projects done for friends or family. Bart looks forward in his continue growth in the firm and meeting our client’s needs.

Maisey Matthews

Receptionist/ Administrative Assitsant

  • 11 years of customer service experience

Maisey joined Erichsen, Kallsen & Associates in 2021 at the beginning of tax season with our sister company Jackson Hewitt.  She will be responsible for meeting the clients and accountants needs in the front office.  She brings a familiar name and face  to the firm being her family is in the finaciance area of business.  In her time away from the office Maisey enjoy her time with her fiance and their house of animals.  Maisey looks forward in continue growth in the firm and meeting our client's needs.