LITIGATION SUPPORT
Litigation Support Services
Advent’s professionals possess the experience and qualifications to deliver the results you need.
Working in collaboration with legal teams, Advent provides clear and conclusive analyses and expert reports that document complex transactions and retell events in an understandable, logical manner. Our highly qualified experts have testified in Local, State, and Federal Courts and before Arbitration Boards and Mediators.
Our Litigation Support Services include, but are not limited to:
- The analysis and rebuttal of valuations and other expert reports
- Bankruptcy and restructuring services
- Business valuations and other expert reports
- Compliance matters
- Discovery, subpoena, interrogatory, and deposition support for Counsel
- Comprehensive analyses and the provision of expert reports measuring economic damages relating to:
- Business interruption, lost profits, lost value, lost opportunity, or increased costs
- Business owner (shareholder) disputes
- Lost income, wages, benefits and/or pension value
- Personal injury, wrongful death, and insurance claims
- Family law/matrimonial matters
- Income analysis
- Internal company investigations
- As well as other Litigation Support Services
Analysis and Rebuttal of an Opposing Expert’s Report
Advent can ascertain whether the opposition’s valuation or damages report is accurate and supportable. It only takes a few errors, omissions or intentional bias to derive a materially erroneous conclusion of value. Consequently, our reviews are often an essential aspect of our litigation support, often framing the key value issues missed, or identifying a weak and/or misleading analysis.
For more information on how Advent’s services can benefit you, please contact us to schedule a consultation.
Get Started!
If you are interested in how our Services can benefit you, please call us at 845.567.0900 or fill out the form below.

Bill provided a comprehensive and thorough valuation analysis of a complex bundle of hard assets, real estate interest and businesses in a litigation matter.

I am working with Bill on a complex litigation matter and he is an excellent source of information and has thoroughly analyzed and addressed the issues that have arisen. He has delivered an expert opinion in a well organized and efficient manner. I highly recommend his services.

I have used Bill several times to provide valuations for operating businesses. I have found him to be responsive, top quality and reasonably priced. I will use him again and suggest you give him a chance as well.
Steven Diamond, Esq.
-Vergilis, Stenger, Roberts, Davis & Diamond

Bill is a knowledgeable business valuation/appraisal expert. His experience includes being qualified as an expert in court proceedings. It is a pleasure working with him.

I have worked with William during the administration of estates. He has provided first rate valuations in a timely fashion. I would not hesitate to recommend him for any valuation project.

I retained William Quackenbush of Advent Valuation Advisors as an expert witness in a complex litigation in federal court in the Southern District of NY. Mr. Quackenbush’s expert valuation testimony was heavily relied on by Judge Alvin K. Hellerstein in awarding my client a judgment for approximately $26 million, inclusive of prejudgment interest and costs and attorney’s fees. In his findings of fact, Judge Hellerstein stated that he found Mr. “Quackenbush to be a credible witness, and … that his appraisal of the option shares was reliable and accurate and persuasive.” I would highly recommend Bill Quackenbush to any attorney seeking an expert with comprehensive knowledge of the banking industry and exceptional expertise in valuation and its methodologies.
Pinchus Raice, Esq.
-Pryor Cashman

Seems to me that the best recommendation for Bill’s work is that I hired him to personally evaluate a business I was going to purchase.

I have worked with and recommended Bill to clients in need of business valuations over the years and each experience has been very successful. Clients enjoy working with Bill as he brings a creative approach to valuations which is firmly grounded in the law and fact. He is an excellent trial witness and enjoys a great reputation within the legal and accounting communities.