Areas of Expertise

  • Bankruptcy Advisory Services
  • Bankruptcy Litigation
  • Complex Commercial Litigation
  • Disputed Valuations
  • Due Diligence
  • Fiduciary Services
  • Financial Restructuring
  • Forensic Accounting
  • IP Damages
  • Litigation Strategy
  • Solvency Opinions


  • Chemical / Petro-Chemical
  • Financial Institutions
  • Healthcare
  • Hotel and Resorts
  • Real Estate
  • Retail & Restaurants
  • Telecommunications

Prominent Cases

  • AstroTurf LLC
  • Fairfield Residential LLC
  • BP Deepwater Horizon Oil Spill Litigation
  • JMV Fixed Income Arbitrage Performance Partners, Ltd


  • CPA
  • ABV
  • ASA
  • CFE
  • CA
  • CBV


  • BBA McGill University
  • Graduate Degree McGill University


Ian Ratner, Chief Executive Officer of B. Riley Advisory Services, is a CPA with more than 30 years of experience in Public Accounting, Forensic Accounting, Business Valuations, Due Diligence Services, Corporate Finance and Bankruptcy Consulting. Ian co-founded GlassRatner (now doing business as B. Riley Advisory Services) in 2001 with Ron Glass and has been instrumental in building the firm into one of the leading multi-office financial advisory services firms in the country, ranked on numerous occasions by the Bankruptcy Insider and TheDeal.Com as one of the top Crisis Management and Restructuring Firms in the nation. In 2018, GlassRatner was also recognized by The National Law Journal and Corporate Counsel as one of the country's top Forensic and Litigation Support providers. In 2018, GlassRatner merged with B. Riley Financial.

Prior to founding the firm, Ian held senior leadership positions with Kroll, Inc., a worldwide risk mitigation firm, and the Financial Advisory Services (FAS) practice at Ernst & Young.

Ian has a diverse practice that covers most of B. Riley Advisory Services lines of business. In the Bankruptcy & Restructuring area, Ian has represented borrowers and lenders in and out of formal bankruptcy proceedings. He has led the firm's efforts on behalf of many Creditor Committees including the Creditor Committees in Nationwide Furniture and Mattress Wholesalers; Value Music Concepts, Inc.; Adventure Parks Group LLC; The Billing Resource, dba Integretel; Fairfield Residential, which was one of the country's top multifamily developers; and AstroTurf LLC which resulted in a successful sale of the business as a going concern to a foreign buyer, to name a few.

During the real estate meltdown of 2007 to 2010, Ian led a variety of real estate (multi-family, retail, condo development and homebuilder) debt restructuring assignments for both single asset/single lender and multi-bank/multi-asset credit facilities, where the face value of the outstanding debts ranged from tens of millions of dollars to billions of dollars. These real estate assignments included supporting the restructuring of the Related Group - one of the nation's largest condo developers headquartered in Miami -and leading the restructure of John Wieland Homes, a major homebuilder headquartered in Atlanta.

Ian has been appointed Special Master, Receiver, Chapter 7 Trustee, CRO, Liquidating Agent and is a trusted Fiduciary. One of his most exciting and high-profile assignments in this area involved being appointed Receiver by the High Court of Anguilla related to several hedge funds whose ownership was disputed. Ian led an international asset tracing investigation and coordinated a complex series of international multi-jurisdictional lawsuits to ultimately recover tens of millions of dollars on behalf of their rightful beneficiaries. Another significant Caribbean assignment includes the investigation of the collapse of CL Financial Limited for the Central Bank of Trinidad and Tobago, whose holdings included CLICO, the largest Caribbean insurer, the largest bank in Trinidad and Tobago, and numerous real estate investments in the US.

In addition, Ian has significant experience in the financial services & fund area. Notable assignments include being retained as the solvency expert in the SageCrest LLC bankruptcy and overseeing the wind-down of several hedge funds and alternative asset funds.

Notwithstanding Ian's proven track record as a Bankruptcy & Restructuring Advisor, he is better known as an Expert Witness in complex commercial litigation cases, fraud investigations and solvency-related valuation disputes. Ian has testified at trials, arbitrations, and depositions on approximately 250 occasions and has worked on matters throughout the United States and Caribbean for law firms, governmental agencies and Fortune 500 companies. He has been retained as a forensic accounting, damages and valuation expert on behalf of countless household names such as UPS, Kodak, PNC Bank, BB&T, HCA, FMNA, Dell, Delta, Equifax, CIBC World Markets, AT&T, Blue Cross Blue Shield, Bellsouth, Verizon, Cingular Wireless, the City of Atlanta, Emory University, University of Kansas, GE, NCR and Honeywell to mention a few. Ian is often called on for high stakes litigation such as his role as an expert witness on behalf of the Special Receiver in Livent, Inc. v. Deloitte & Touche LLP, various plaintiffs in the Engle Progeny-Tobacco Litigation, or his role as an expert on behalf of the Department of Justice in the penalty phase of the BP Deepwater Horizon Oil Spill Litigation and more recently was the damages expert on behalf of the Liquidating Trustee - Plaintiff in Pearson v. Deutche Bank AG where the Jury awarded $95 million dollars to the plaintiffs in a complex matter related to an international Ponzi Scheme that ended up in Bankruptcy.

As a result of Ian's diverse business experience, valuation credentials, and personable nature he has become a frequent "independent" in valuation disputes and advisor to wealthy families and businesses. He is a long time Board Member of TST Impreso, Inc. a manufacturer and distributor to over 5,000 dealers and other resellers of various paper and water products for commercial and home use in domestic and international markets and a former Board Advisor and Board Member of Scholle IPN a major international flexible packaging business with a global footprint.

Mr. Ratner is a CPA, an ASA (Accredited Senior Appraiser, Business Valuation Section of the American Society of Appraisers), a CFE (Certified Fraud Examiner) and holds the ABV designation for CPAs Accredited in Business Valuation granted by the AICPA. He is an accomplished public speaker on a variety of topics such as due diligence, bankruptcy litigation and business valuations. He has led more than 125 CLE programs and training seminars for law firms around the country and professional conferences such as the ABI (American Bankruptcy Institute), Southeastern Bankruptcy Workshop, the AIRA (Association of Insolvency and Restructuring Advisors), VALCON, several AICPA conferences and university classes. Ian has been interviewed on the Nightly Business Report, Fox Business and featured in the ABF Journal. He holds graduate and undergraduate business degrees from McGill University in Montreal, Quebec. Mr. Ratner co-authored a Wiley textbook called Business Valuation and Bankruptcy in 2009 and was inducted as a Fellow in the American Bankruptcy College in 2010.

For 2017, 2018, 2019, 2020 and 2021, Ian has been recognized as one of the Top Individual Expert Witness—Economic by the Daily Report in their "Best of" edition. In 2017 and 2018, Ian was named as one of the Top 100 Restructuring & Turnaround Professionals by the Global M&A Network.

B. Riley Advisory Services works with lenders, law firms, private equity sponsors and companies of all types. Our Advisory Services are a unique mix of Valuation and Appraisal Services including asset-based lending (ABL) Valuations; Restructuring and Turnaround Management; Forensic Accounting and Litigation Support; Operations Management; Compliance, Risk & Resilience Services; and Transaction Support Services including Due Diligence and Quality of Earnings Reviews. B. Riley Advisory Services is the trade name for GlassRatner Advisory & Capital Group, LLC, Great American Group Advisory & Valuation Services, LLC, Great American Group Machinery & Equipment, LLC, and Great American Group Intellectual Property Advisors, LLC.