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Frank is a dedicated professional who is always seeking a positive outcome for those he works with.


Diane S. - Texas

Frank Lambertus, CPA - Owner

I have been serving the accounting and tax needs of individuals and owners of small to mid-sized businesses in North Carolina, Colorado, Arizona and nationwide since I founded Lambertus CPA in 2009. In addition to taxes, client engagements have also included: 

  • Calculating simple, repeatable product costing so clients with side gigs or craft businesses can better determine profitable pricing for their efforts.
  • Developing key metrics and performance indicators (KPI’s) which clients can easily monitor to help keep their revenues rolling in.
  • Assisting new clients become current with their tax compliance who hadn’t been for many years, often due to complicated family transitions.
  • Providing expert witness testimony to support a legal judgment for my client by re-creating past financial transactions (over several years) to identify fraudulent withdrawals.
  • Suggesting simple process controls clients can implement to increase their likelihood of proper handling of their financial transactions, cash and other assets and reduce errors.


Before starting Lambertus CPA, I spent 14 years in public accounting firms (regional and Big 4) providing audits, controls and compliance services to a wide variety of organizations. I rounded out the rest of my career with private enterprises in various technical positions including internal audit, securities and regulatory reporting, compliance testing, and governance, risk, and controls.


I am a native West Virginian (Montani Semper Liberi) and graduated from Vanderbilt University, where during my senior year I took an accounting class and never looked back.  I moved to Colorado to ski while working my way through night school at the University of Colorado to earn a Master’s degree in Accounting.  I began my professional accounting career in Denver and fell in love with the west, ultimately settling in Phoenix in 2005 where even the dry heat is its own form of paradise.  When I am not working, I still enjoy skiing, hiking, home improvement, and attempting to play golf. 

credentials

Certified Public Accountant

  • Arizona     #14137

CPA Firm License

  • Arizona     #3091

Prior Certifications

  • Certified Internal Auditor                           #194133
  • Certified Information Systems Auditor     #21173691
  • Certified Management Accountant          #904836
  • CPA - North Carolina                                  #42924
  • CPA - Colorado                                           #17732
  • CPA - Texas                                                 #110398
  • CPA - Montana                                           #5268

Verify a cpa licenseverify irs credentialed tax preparer

education

MS Accounting

     University of Colorado


BS Engineering Science and Economics

     Vanderbilt University

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