William P. Callahan, Esq. (Retired)

Bar and Court Admissions

Member NY Bar
U.S. District Court, SDNY
U.S. District Court EDNY
Second Circuit Court of Appeals
Third Circuit Court of Appeals
Fifth Circuit Court of Appeals


International Bar Association, London, UK

Federal Appointments

Appointed by Judge Charles S. Haight, Jr.,
U.S. District Court, SDNY, as Independent Investigator
Under a Consent Decree over the Carpenter’s Union (2005- 2010)


President & CEO, United Intelligence Group, Inc
NY Licensed Private Investigator
Director, The London Security Group, Co.UK
Constituent Member, Overseas Security Advisory Council (OSAC) – US State Department
Association of Former Intelligence Officers (AFIO)
Association of the United States Navy
Victory Services Club London (UK)
Guest Lecturer, Maritime Security, SUNY Maritime College (Ft. Schuyler, NY)
Association for Unmanned Vehicle Systems International
Northeast UAS Airspace Integration Research Alliance
New York City Drone User Group (NYCDUG)
Member, American-Pakistan Foundation

About William

William P. Callahan specializes in governmental relations and litigation matters including aerial unmanned vehicles (UAS) known as Drones and defense matters related thereto. Mr. Callahan is a member of the New York Bar and is duly licensed as an Attorney At Law.

Mr. Callahan served in the Department of Justice as a trial lawyer in the Criminal Division and Narcotics Section, New York and D.C. While with the Department of Justice, Mr. Callahan was assigned as Regional Counsel to the DEA (Drug Enforcement Task Force) New York while with ODALE, (Office of Drug Abuse Law Enforcement) overseeing federal enforcement of narcotics laws.

He was appointed by the Director of ODALE and Special Assistant to the President to be the Coordinator of CENTAC 2 (DEA – Central Tactical Unit) to coordinate a major heroin conspiracy investigation involving the Frank Matthews narcotics organization among the various governmental agencies such as the CIA, Drug Enforcement Administration, IRS, Department of State, U.S.Army and Interpol.

Mr. Callahan entered into the private practice of law in 1980, acting principally as Investigative Counsel to the Bar. From 2005 – 2010, Mr. Callahan was appointed by the Federal District Court, SDNY (Judge Charles S. Haight, Jr.) to be the Court’s Independent Investigator charged with enforcing the terms of a Consent Decree involving the District Council Carpenters (Carpenter’s Union) and enforcement of all applicable Federal, State and Local laws.

Mr. Callahan served on active duty in the United States Navy (Air Wing) for a combined total of eight years of active duty and active reserve status. He received specialized training and schooling in Naval Air specialty schools such as Airman’s School (10 weeks) which included intense basic air training leading to crew member qualification status in fixed wing patrol aircraft. Stationed in Norfolk, VA.

He attended and completed 53 weeks of intensive schooling in aviation electronics countermeasure school. He thereafter served as a crew member on board the Lockheed P2V aircraft as a countermeasures specialist based out of Guantanamo Naval Air Station, Cuba.

Since 2012, Mr. Callahan has been immersed in Drone (UAV) technology in regards to operational and legal matters and defense.

Related Practices

White Collar Crime
Money Laundering Investigations
Corruption Investigations
Aerial Drone and Def