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Susan B. Cassidy is a Chambers rated partner in the firm’s Government Contracts Practice Group and is co-chair of the firm’s Aerospace and Defense Industry Group. Ms. Cassidy advises clients on the complex rules and regulations imposed on government contractors at all phases of the procurement cycle. She combines a sophisticated knowledge of the FAR and DFARS with the practical insight gained from senior in-house positions at both dedicated defense and commercial item contractors.

Ms. Cassidy has particular expertise in the complex regulatory intersection of cybersecurity and government contracts and regularly advises clients on the unique risks associated with a cyber incident involving sensitive government information. Ms. Cassidy also has an active practice counseling clients on a variety of supply chain issues, including Section 889, the Supply Chain Executive Order, counterfeit parts requirements, product exclusions, and DoD’s Cybersecurity Maturity Model Certification (CMMC). She is able to draw on both her knowledge and experience with the Defense Department and the Intelligence Community to help her clients navigate among the many government stakeholders whose interests may be impacted.

  • Lead counsel on multiple internal investigations and disclosures with regard to DoD Cyber Incident Reporting, FAR mandatory disclosure obligations, the False Claims Act, national security requirements, the False Statements Act, the Anti-Kickback Act, the Byrd Amendment, and the Procurement Integrity Act. Representation and favorable resolution of investigations with Agency, OIG, DOJ, and SDO.
  • Lead counsel conducting internal investigation and successful negotiations with government to clear client with regard to product substitution and MIL-SPEC compliance. 
  • Lead counsel advising defense contractors on responses to cyber incidents, including interface with DoD, law enforcement and forensic consultants. 
  • Numerous matters advising clients on the full spectrum of procurement and compliance obligations including, FAR and DFARS requirements, cybersecurity and supply chain risks, MIL-SPEC qualification and retention of qualification requirements, counterfeit part obligations, sourcing requirements (BAA and TAA), socio-economic requirements, CDA claims, TINA requirements, commercial item determinations, organizational conflicts of interest, cost allowability issues, technical data rights, M&A due diligence and novations, revolving door restrictions, ethics and business conduct issues, and the creation and implementation of government contracts compliance programs.
  • Lead government contracts counsel advising top-ten defense contractor on a multi-million-dollar prime-subcontractor dispute in connection with a NATO contract.
  • Lead government contracts counsel representing top 25 defense contractor in a state court appeal of a quarter billion dollar adverse judgment in a prime-subcontractor dispute.
  • Lead counsel in post award bid protest successfully convincing agency to reopen procurement, allow opportunity for new proposal submissions, and ultimately change its decision and award to our client.
  • Lead government contracts lawyer advising Fortune 100 financial services corporation on all aspects of federal novation and various state procurement restrictions on the transfer of assets in connection with the company's global reorganization of various business units.

Pro Bono

  • Represent multiple U.S. veterans in various benefits applications. 
  • Successfully represented non-profit agency in grant award negotiations with the Department of State.
  • Successfully resolved payment dispute for non-profit victim assistance agency against government entity allowing non-profit to continue operating.
  • Advised non-profit organization on DC procurement rules and requirements for competitive bid.
  • Successfully convinced Department of Justice to release documents in FOIA litigation that were essential to underlying action against the Department of Housing Urban and Development.

Memberships and Affiliations

  • Intelligence and National Security Alliance - Legal Working Group 
  • Fellow - American Bar Foundation
  • American Bar Association - Public Contract Law Section, Division Co-Chair (2018-2019, 2019-2020) 
  • American Bar Association – Public Contract Law Section; Co-Chair - Cybersecurity, Privacy and Data Protection Committee (2014-2018); Vice Chair (2018-2019)
  • American Bar Association – Public Contract Law Section; Member - Counterfeit Parts Task Force (Acquisition Reform & Emerging Issues Committee)   
  • American University, Washington College of Law, Adjunct Professor of Law (2009-2013, Spring 2015)
  • National Defense Industrial Association Cyber Division Cyber Legal Regulatory Policy Committee

Previous Experience

  • Northrop Grumman Corporation, Information Systems Sector, Senior Counsel
  • Motorola, Inc., U.S. Federal Government Markets Division, Senior Counsel
  • Chambers USA, Government Contracts (2019-2020) 
  • National Law Review, “2018 Go-To Thought Leader," Cybersecurity for Government Contractors (2018)
  • Legal 500 US, Government Contracts (2016-2017) 
  • Washington DC Super Lawyers, Government Contracts (2015-2020)
  • Who's Who Legal, Government Contracts USA (2018, 2019) 
  • Law360, Government Contracts Editorial Advisory Board (2014)