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Our Experience


Welcome to

The Mance Leahy Group.

As a company, we recognize that our client's individual and business success are important. We are focused on meeting our clients needs and assisting them with growth opportunities for their success.

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Our Mission 

Our mission is to provide quality professional accounting services and to assist our clients in improving their financial position and wealth. The firm is committed to serving the public interest, understanding their needs, recognizing their strengths and weaknesses, identifying their opportunities and threats, and finding solutions to their challenges.

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Company Profile

Business Summary

The Mance Leahy Group (TMLG), based in Columbia, Illinois, a St. Louis, Missouri suburb, provides accounting, business, and  financial solutions to individuals, small and medium sized businesses and organizations. The privately owned firm was founded in 1991 by a management accounting executive, a management information system executive, and a certified public accountant.

More Than Accountant's and CPA's

The firm employs a professional staff of accounting, marketing, tax, and management accounting consultants ranging from certified public accountants, management accountants to enrolled agents.

Every three years the firm's quality control processes are evaluated by an outside firm.  Please click this link to see our most recent Peer Review Report.


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Contact Information


618-281-7311 or 314-428-2010


618-281-8399 or 314-428-6726

Postal address

816 South Main, Suite 1, Columbia, IL 62236

Electronic mail

Partner: NMance@tmlg.com
Partner: SLeahy@tmlg.com

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Last modified: July 27, 2011