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, investment performance, lost wages, and prejudgment interest, among others. Having served as the Controller and Financial Manager of a small business for 7 years, Mark has experience managing the accounting and finance activities within a company.

Mark has worked on cases involving claims of breach of contract, patent and trademark infringement, trade secret misappropriation, breach of fiduciary duty, defamation, class action disputes, shareholder disputes, divorce proceedings, corporate investigations, construction disputes, and personal injury.

Mark has been involved in complex litigation matters for a wide variety of industries including, telecommunications, financial services, computer and internet software, biotechnology, media and advertising, construction, third-party logistics, wholesale distribution, agriculture, consumer products, energy, casino gaming, industrial equipment, medical products, transportation, and trust and estate management, 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)


American Institute of Certified Public Accountants (AICPA)

Licensing Executives Society (LES)