Professional Qualifications

Mr. Callahan represents government contractors on a broad range of litigation matters, including false claims investigations and actions in the defense, construction, and medical industries; bid protests and contract claims at the federal, state and local levels; and prime/subcontractor disputes in state and federal court, arbitration and mediation. Mr. Callahan also counsels government contractors and grantees regarding their compliance with contract and legal requirements, accounting standards and audit practices.

Mr. Callahan has significant experience in the government contracts and construction industries. He has prosecuted and defended bid protests of contract awards involving major civil and facilities construction projects. He has investigated, prepared, and litigated requests for equitable adjustment, termination settlement proposals, and other claims involving billions of dollars of costs whose cause is disputed. In these matters, Mr. Callahan often works closely with forensic accounting firms, and he counsels client leadership on the timing, framing, and tone of the submissions and legal filings, and on negotiation and litigation strategy.

Mr. Callahan frequently contributes to bar publications and scholarly journals. Among other publications, his articles have appeared in the Procurement Lawyer, A.B.A. false claims acts and construction books, William & Mary Law Review, Cardozo Law Review, The Government Contractor, Legal Times (Washington), New York Law Journal, and The Federal Lawyer.

Clerkships

Hon. D. Brooks Smith, United States Court of Appeals for the Third Circuit,
2004-05 Term

Hon. Jackson L. Kiser, United States District Court for the Western District of Virginia, 2003-04 Term

Education

J.D., William & Mary Law School

M.B.A., William & Mary Graduate School of Business

B.A., University of New Hampshire

Bar Admissions

California
District of Columbia
New York