Mark Dennis is a Partner with SL Biggs, a division of SingerLewak


Mark has extensive experience providing tax consulting and preparation services to individuals, partnerships and corporations. In addition, Mark provides forensic accounting and litigation support services to bankruptcy trustees, attorneys and debtors. Mark advises on issues such as court reporting, asset administration, tax attribute utilization, preference and insider actions and Chapter 11 Debtor-in-Possession reorganizations.  Mark has been admitted and testified as an Expert in the U.S. Bankruptcy Court and has been appointed by the U.S. Department of Justice as a Subchapter V Trustee for Region 19 (Colorado and Wyoming).  Mark was formerly the President of Dennis & Company, P.C., which combined its practice with SLBiggs in June 2020.

Industries & Focus

Financial Services, Real Estate, Professional Services, Medical, Legal, Insolvency and Litigation.

Education & Affiliations

Mark graduated from Cornell University in 1992 with a Bachelor of Arts (BA) in Economics and from the London Business School in 1999 with a Masters of Business Administration (MBA). He is a Certified Public Accountant in Colorado and holds the AICPA’s Certified in Financial Forensics (CFF) credential.   Mark is a member of the Colorado Society of CPAs, the American Institute of Certified Public Accountants, the American Bankruptcy Institute, the National Association of Bankruptcy Trustees and the Turnaround Management Association.