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Partners, principals and associates

Derek Hammen La Crosse

2 Copeland Ave.
La Crosse, WI 54603



Email: derek.hammen@wipfli.com

Derek Hammen, CPA, CFE, MBA


Derek Hammen is a manager with over 12 years of experience in providing audit, assurance and accounting services. He is attuned to the accounting and audit needs of various types of clients, from startup businesses to established companies in the manufacturing and distribution, technology, retail and nonprofit industries. In addition, Derek consults with his clients on various technical accounting issues in accordance with U.S. GAAP. Clients appreciate his detailed approach to understanding their issues to help them overcome challenges and meet their goals.

Derek is also the director of Wipfli’s Commercial Industry Technical Issues Committee.


  • Certified Public Accountant
  • Certified Fraud Examiner

Professional memberships and activities

  • American Institute of Certified Public Accountants (AICPA) – Member
  • Wisconsin Institute of Certified Public Accountants (WICPA) – Member
  • Association of Certified Fraud Examiners (ACFE) – Member


Audit and Accounting

Areas of Focus

  • Technical U.S. GAAP research and assessments
  • ASC 606, Revenue from Contracts with Customers, assessments


University of Wisconsin–La Crosse
  • Bachelor of science degree in accounting
  • Master of business administration