About Arlen

Arlen Lasinsky is a Director in the Advisory Services Group of Marcum LLP. He joined Marcum in 2015 via the Firm’s merger with Frost, Ruttenberg, & Rothblatt P.C., one of the largest full-service accounting firms in the Chicago region. Mr. Lasinsky focuses his time solely in litigation, forensics and business valuations. In his role in litigation and forensic Services, Mr. Lasinsky’s investigations and testifying experience has uncovered and proven fraudulent activity, facilitated settlements of lawsuits and shareholder disputes, and aided in the defense of innocent clients.

Mr. Lasinsky has more than 38 years of experience as an auditor, controller, CFO and treasurer, consultant and fraud investigator. He uses his expertise to support legal counsel and their clients through contentious situations, such as civil and criminal litigation and fraud investigations. Mr. Lasinsky’s experience and expertise have enabled him to provide services nationally and internationally. He has been a significant force in developing the firm’s reputation as a leader in forensics and litigation support.

Mr. Lasinsky provides business valuations and financial advisory services to a wide range of clients and industries, including health care, senior care, real estate, manufacturing, distribution, wholesale, food, retail, construction, investment and service industries. Mr. Lasinsky has consulted on the sale and purchase of interests in closely held entities as well as formal valuations for estate and gift tax purposes, S corporation elections, mergers and acquisitions, divorce, dissenting shareholders, damages, entity dissolutions/break ups and insolvency.

Among his accomplishments, Mr. Lasinsky:

  • Represented a Fortune 25 company in a matter brought forth by the plaintiff who claimed alleged tortuous interference, breach of contract and defamation on the part of the company. He analyzed the opposing expert’s reports and prepared his report reflecting his opinion on those reports. The court granted motion for summary judgment in its entirety in favor of the company.
  • Was engaged by a law firm to investigate an embezzlement occurring from the law firm’s client trust account, Mr. Lasinsky investigated the matter and prepared his report detailing the embezzlement, demonstrating the fraud was an isolated matter and that the client trust account was properly updated and returned to the proper balance. No further action was taken by the Illinois Attorney Registration & Disciplinary Commission.
  • Testified as an expert witness in a fraud matter. He reviewed documents and opined in his expert report presented to the court demonstrating the defendants had committed fraud. The matter was settled shortly before the trial was to commence for the benefit of FR&R’s clients.
  • Represented a major financial institution in a matter brought forth by the plaintiff claiming alleged breach of contract on the part of the financial institution. Mr. Lasinsky prepared his report demonstrating there would be no damages, or if the trier of fact did find in favor of the plaintiff, damages would be approximately 0.5% of the amount the plaintiff was seeking. The matter was dismissed on the successful granting of motion for summary judgment in its entirety.
  • Represented the Attorney General of the Republic of Trinidad and Tobago, West Indies in a matter pertaining to allegations of impropriety, publicly raised against the Water and Sewerage Authority of Trinidad and Tobago. Mr. Lasinsky calculated damages with respect to allegations raised, and the results of the investigation reflected no basis for the allegations.

Professional & Civic Affiliations

  • American Bar Association
  • American Institute of Certified Public Accountants (AICPA)
  • Association of Certified Fraud Examiners
  • Association for Financial Professionals
  • American Society of Appraisers
  • Illinois CPA Society
  • The National Association of Certified Valuators and Analysts

Articles, Seminars & Presentations

  • “Warning Signs-What to Look For to Prevent Potential Disaster”

    National Litigation Consultants’ Review, December 2007
  • “Sox Alone Won’t Stop Fraud”
    M World/The Journal of the American Management Association
    , June 2003
Industry Focus

Litigation Support


BS, Accountancy, with Honors and Distinction
University of Illinois, Chicago