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St. Charles

Get results that transform from a top accounting and business consulting firm

As needs arise in an ever-changing business environment, you need the resources of a firm with a broad array of resources.

At Wipfli, a top 20 national firm, we’re proud to give our clients the value and experience of a diverse firm that specializes in a wide range of services and industries.

With assurance, accounting, tax and consulting services customized to your needs, Wipfli helps you overcome challenges, achieve your goals and plan for future success.

St. Charles

2460 Executive Drive
St. Charles, MO

Phone: 636.441.5800
Fax: 314.862.1549

Specialized services in the St. Charles area

Our associates focus on specific areas to be able to provide in-depth knowledge and industry-specific solutions. Some of the industries our St. Charles accountants and business consultants specialize in include: healthcare, manufacturing and distribution, nonprofit, real estate and construction.

Our St. Charles office also offers many specialized services for businesses and individuals, including tax services, audit and assurance, healthcare billing and recovery services, Medicare and Medicaid cost reporting, and litigation support.

Learn more about Wipfli here.

Our St. Charles, Missouri office, formerly Mueller Prost, joined Wipfli effective June 1, 2021 to provide their clients with expanded capabilities, additional cutting-edge services and more technology consulting.


Our Missouri offices have been recognized for the following:

  • Accounting Today Regional Leaders – Top 100 Firms: Midwest 2020, 2021
  • Inside Public Accounting Top 200 & Top 200 Fastest Growing Firms, 2018-2020
  • St. Louis Post Dispatch, Best Places to Work, 2021
  • St. Louis Business Journal Best Places to Work, 2016-2020
  • St. Louis Business Journal, Largest Accounting Firms List, 2015-2020
  • Small Business Monthly in St. Louis Best Accounting Firm 2015-2022
  • St. Louis Business Journal, St. Louis’ biggest corporate philanthropists – midsize, 2020
  • St. Louis Business Journal, Who’s Who in Law and Accounting 2015

Community involvement

We are invested in the communities where we work and live, and are involved with the following organizations:

  • Greater St. Charles County Chamber of Commerce
  • Alzheimer’s Association
  • Cystic Fibrosis Foundation
  • American Foundation for Suicide Prevention
  • Five Acres Animal Shelter
  • Boys & Girls Clubs of America
  • Ronald McDonald House Charities
  • College Bound
  • St. Jude Children’s Research Hospital
  • Associated General Contractors – Missouri Chapter
  • LeadingAge Missouri
  • Missouri Healthcare Association
  • Missouri Alliance for Home Care
  • Missouri Association of Manufacturers
  • Missouri Restaurant Association

Partners, principals and associates

Chris Althage
Chris Althage, CPA
Caty Beilsmith
Caty Beilsmith, CPA, CCFIP
Whitney Fossum
Whitney Fossum, CPA
Senior Manager
Adam Hill
Adam Hill, CPA
Kelly Kersting
Kelly Kersting
Quinn Martin
Quinn Martin, CPA
Kali Weidenbenner
Kali Weidenbenner, CPA
From curiosity to clarity to results. That's Wipfli.

Our clients rely on us because we see their success the same way they do: As a continual process. We know that business is fluid and results aren’t an endpoint; they’re waypoints on a trajectory toward success.