Mark Longo
(312) 506-1503

Mark Longo is a Director at Davis & Hosfield Consulting LLC. His practice is focused on providing economic and financial damages consulting and expert witness assistance to clients and counsel in commercial disputes. Mark has been retained as an expert on economic damages for cases in federal and state courts and has testified as an expert witness at deposition and arbitration. Mark has over 10 years of experience consulting on complex financial and accounting matters.  He has performed analyses of actual loss, unjust enrichment, reasonable royalties, lost profits, business valuations, business interruption, fixed and variable costs, investment performance, lost compensation, and prejudgment interest, among others. Mark has also provided consulting services to small businesses in the areas of accounting and financial management.

Mark has worked on cases involving claims of breach of contract, patent infringement, trademark and copyright infringement, trade secret and confidential information misappropriation, breach of fiduciary duty, defamation, class action disputes, shareholder disputes, fraud, construction disputes, and other types of business disputes.

Mark has been involved in complex litigation matters for a wide variety of industries including telecommunications, computer and internet software, biotechnology, medical products, financial services, private equity, manufacturing, industrial and consumer products manufacturing and distribution, construction, and automotive, among others.


B.S. Accounting – University of Illinois at Urbana-Champaign (Honors)

M.A.S. Accounting – University of Illinois at Urbana-Champaign


Certified Public Accountant (CPA)

Accredited in Business Valuation (ABV)


American Institute of Certified Public Accountants (AICPA)

Illinois CPA Society and American Bar Association (Associate Membership)

Licensing Executives Society (LES)