Dennis Walsh is a senior managing director at Guidepost Solutions LLC.  He is an experienced litigator and former prosecutor. His work for Guidepost focuses on monitoring and compliance matters as well as complex investigations.

Prior to joining Guidepost Solutions, Mr. Walsh served as the Review Officer in the matter of United States v. District Council of Carpenters, et al., 90 Civ. 5722 (SDNY).  As Review Officer, Mr. Walsh was responsible for enforcing the Consent Decree and other orders of the District Court in this long-standing civil RICO matter. He was given broad authority to enforce the Court’s permanent injunction against racketeering activity and monitor, investigate and reform the administration and governance of the New York City District Council of Carpenters, its Taft-Hartley Benefit Funds (with a combined value of some five billion dollars) and its eight affiliated local unions, which have over 20,000 members. He filed nine lengthy reports with the District Court and his efforts have been the subject of articles in The New York TimesThe Daily News, The New York Post and Crain’s. Mr. Walsh’s service required his application of expertise in a broad range of areas, including litigation, complex investigations, RICO and criminal law, ERISA and labor law, compliance, business administration and contracts, collective bargaining and administrative law.


From 2019 to 2024, Mr. Walsh assisted the federal monitor for the New York City Housing Authority, and led the lead-based paint and mold remediation workstreams, among other responsibilities.

As an attorney, Mr. Walsh assisted in monitoring international corporations in the automotive, energy, financial and technology sectors. He has also undertaken multiple civil litigations, criminal appellate, administrative law and bankruptcy-related matters. These cases have involved a range of issues involving contracts, product liability and negligence, competitive intelligence, securities and natural gas and oil trading regulations, banking regulations and compliance, construction, labor and criminal issues.

Mr. Walsh served as an Assistant Deputy Attorney General with the New York State Attorney General’s Organized Crime Task Force (“OCTF”) from 1999 through 2005. He conducted large scale investigations involving labor racketeering and Cosa Nostra. Significant accomplishments included two multi-year investigations of Mafiosi and union officials and the resulting prosecutions and convictions. One investigation led to the prosecution of certain officials from the Plumbers and Steamfitters Unions, and the implementation of an independent private sector inspector general agreement which Mr. Walsh drafted, negotiated and executed with the reform administration of the Plumbers Union. In the other matter, working with the NYPD’s Organized Crime Investigation Division, and the U.S. Department of Labor, he conducted and supervised an extended wiretapping investigation, leading to the prosecutions of numerous Mafiosi and officials of the International Union of Operating Engineers in New York. He also worked in close cooperation with the FBI. Mr. Walsh was designated as a Special Assistant United States Attorney in both the Southern and Eastern Districts of New York in the two RICO cases that prosecuted the criminal conduct revealed by the OCTF and federal investigation of Mafiosi and the Operating Engineers - including extortion, mail fraud, bribery, kickbacks and no-show jobs at numerous public construction sites in New York City. In recognition of his work as a prosecutor in these matters, Mr. Walsh was given the Louis J. Lefkowitz Memorial Award by the New York Attorney General in 2003.

Mr. Walsh is a graduate of the Benjamin N. Cardozo School of Law, where he served as the Business Editor of the Cardozo Law Review. He was formerly associated with Mudge Rose Guthrie Alexander & Ferdon and Latham and Watkins where, among many litigation and investigative matters he assisted the ombudsman of a securities firm pursuant to a federal deferred prosecution agreement, analyzing trading records, interviewing brokers and writing segments of reports submitted to the United States Attorney. Mr. Walsh also conducted an extensive multi-city investigation of Medicare billing practices on behalf of a national hospital corporation and also litigated matters involving construction of the Shoreham nuclear plant, corporate, environmental, antitrust, health care, labor, and bankruptcy, contract, tort, and RICO issues. His litigation experience ranges from pleadings, through discovery, depositions, motion practice, court appearances and appeals in state and federal courts.

Mr. Walsh is a member of the Federal Bar Council. He is admitted as an attorney in the courts of the State of New York and in the Southern and Eastern Districts of New York.

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