SFG’s forensic accounting team is comprised of former “Big Four” forensic accounting professionals, Certified Public Accountants (CPA), Certified Fraud Examiners (CFE), Certified in Financial Forensics (CFF), and former FBI agents. Our professionals also speak multiple languages including Spanish, Cantonese, and Mandarin. Within 24 hours and regardless of location, our U.S. based team is ready to travel globally to help address your international matters. SFG also has alliances with a select number of in-country forensic accounting resources to provide related expertise if required.
SFG professionals have assisted a variety of clients ranging in size from small and medium-sized companies to Fortune 500 companies. We work closely with our clients and may also be engaged directly by their legal advisors to deliver expert financial and accounting advice. We have assisted multi-national clients having operations in various countries across the globe and collectively in over 60 countries. Our international experience and network allows us to quickly bridge cultural gaps while providing high quality and efficient solutions.
Founder / CEO
Adrian Sierra is the Chief Executive Officer of Sierra Financial Group (SFG). His professional experience has provided him with a wide array of knowledge in the areas of accounting, forensic accounting, forensic technology, litigation support, and taxation. Adrian has testified as an accounting expert witness and has prepared expert reports. Adrian has conducted multiple engagements within the United States, Canada, Latin America, Europe, and Asia.
Michael Dyer is a Managing Director with Sierra Forensic Group (SFG). His professional experience has provided him with a wide array of knowledge in the areas of accounting, forensic accounting, various types of investigations and litigation support. Michael has extensive experience testifying in Federal and State Court in both criminal and civil matters.
Kerry Haberkorn is a Director with Sierra Forensic Group (SFG). Kerry has devoted her professional career to the field of forensic accounting, which includes over 18 years of experience. She has most recently participated on matters involving fraud investigations as well as FCPA due diligence and compliance projects for clients having significant global operations involving coordination and assessment of operations in over 60 countries.
Yohanna Siegler is an Associate with Sierra Forensic Group (SFG), a firm specializing in Anti-Corruption and Foreign Corrupt Practices Act (FCPA) matters, Litigation and Dispute Services and Forensic Accounting.
Rosa Soto is an Associate with Sierra Forensic Group (SFG). Rosa has devoted her professional career to the field of accounting. As an Associate with SFG, Rosa has been involved in various global forensic accounting engagements.
Samanta Rubio is the Director of SSR Consulting and an Affiliate of Sierra Forensic Group (SFG). Samanta's professional experience has provided her with a wide array of knowledge in the areas of accounting, forensic accounting, and financial services.
Dennis S. Medica is a Managing Director of Medica CPA and an Affiliate of Sierra Forensic Group (SFG) and has over 20 years of experience in providing consulting and forensic accounting services to senior executives, board of directors and legal counsel.
James E. Bucrek
Jim is the President of James E. Bucrek LLC, and an Affiliate of Sierra Forensic Group (SFG). He has over 40 years of private sector and consulting experience in government contracting with a diversified background in estimating, pricing, cost accounting, billing, contracting and compliance.