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Who we are

Willis PSC. Paul A. Willis

Paul A. Willis, CPA, CMA, MBA


Prior to his ownership of Willis PSC Paul had over twenty years of broad, international experience in a wide variety of industries and disciplines. Paul has in-depth expertise in project finance issues, contracts, project and software revenue recognition issues, generally accepted accounting principles (US and international), accounting policy, planning, forecasting and mergers and acquisitions accounting and due diligence. Paul is committed to the highest standards of integrity and professionalism and is known for his ability to foresee and identify key trends impacting the success of each business's operations.

Paul is licensed as a CPA in Minnesota and Texas as well as being certified as a CMA. He received his MBA in Finance and International Business in Leuven, Belgium at the Katholieke Universiteit Leuven and his BBA in Accounting from Abilene Christian University.

Willis PSC. Mark Undis

Mark Undis, CPA, CVA
Accounting/Business Manager


Mark has over 35 years of experience providing individuals and family owned businesses with tax, accounting, finance and valuation services. Mark earned his CPA license in 1982 and added the CVA, Certified Valuation Analyst, credential in 2004. Mark brings an exceptionally strong background in strategic planning for small businesses and a passion for helping clients improve bottom line results.

Often when business owners want to transfer the business to the next generation there are numerous stakeholder’s interests to be balanced. Mark has extensive experience working with succession planning and focuses the efforts on ensuring long term business success as well as intra family relationships.