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About Me

Mr. Croessmann represents numerous architectural and engineering firms, environmental consultants, insurance companies and contractors in both simple and complex litigation.  He is also involved in providing a wide range of services that are tailored to the construction industry.  The services include contract negotiation, government contracting, business planning, risk management, ownership transition, and mergers and acquisitions. Further, Mr. Croessmann has been heavily involved in litigating insurance coverage disputes involving Superfund, environmental claims and construction defects. 


In addition to his legal practice, Mr. Croessmann co-founded the Matrix Design Companies where he currently serves as president of Matrix IMA an architectural firm specializing in forensic, litigation support and expert witness services and as a principal/general counsel of the Matrix Design Companies.  Previously, Mr. Croessmann also served as a lobbyist and deputy general counsel for the American Institute of Architects in Washington, D.C. Mr. Croessmann is also active in industry associations.  He is a member American Institute of Architects and was on the Board of Directors and the 2004 President of the Northern Virginia Chapter of the AIA. He is active in the Associated Builders and Contractors of Virginia and the American Bar Association’s Construction Fourm. He has also served as an arbitrator for the American Arbitration Association and is actively involved in alternative dispute resolution


Representative Cases:

·         Negotiated a Construction Management at Risk contract with a public agency for construction of a 100 million dollar Water Treatment Plant in Florida.

·         Prepared and assisted in negotiating several claims and change orders under a design build contract on an 87 million dollar modernization of a waste water treatment plant in Tacoma Washington.

·         Drafted and pursued a delay and inefficiency claim against the Maryland State Transportation Authority.

·         Defended an architect in a claim involving the observation tower on the Woodrow Wilson Bridge in Washington D.C.

·         Defended a structural engineer in a claim by the Argentine Navy for settlement damage caused by sheeting and shoring system in Washington D.C.

·         Successfully defended a Securities Fraud case in U.S. District Court and the subsequent appeal in the U.S. Court of Appeal.


Practice Areas


  1. Construction & Development: 70%
    33 years, 100 cases
  2. Business: 20%
    33 years
  3. Real Estate: 10%
    33 years



Hourly ($165-330/hour), Contingent (25-33%), Free Consultation (60 minutes)

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Contact Info

Westberg Croessmann & Warren, PC

7331 Wilson Road
Warrenton, VA, 2oi86

PO Box 14652
Irvine, CA, 92623



VAAuthorized to practice law198703/11/2014
DCActive 198105/25/2015
NYCurrently registered 198103/11/2010

Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Award NameGrantorDate Granted
Distinguished LeadershipAmerican Institute of Architects - Northern Virginia Chapter2004
Recognition of Service to the ChapterAmerican Institute of Architects - Northern Virginia Chapter1998
Work Experience
TitleCompany NameDuration
Managing PrincipalWestberg Croessmann & Warren, PC2004 - Present
PartnerBastianelli Brown & Kelly, Ltd2000 - 2004
AttorneyKasimer & Ittig1996 - 2000
Association NamePosition NameDuration
American Institute of ArchitectsN/AN/A
American Bar AssociationN/AN/A
Associated Builders and ContractorsN/AN/A
American Arbitration AssociationN/AN/A
Publication NameTitleDate
Thompson WestExpert Witnesses, Construction Cases - Working with your Construction Expert2009
AIA / Los Angeles, 2006 and SMPS/PSMA National Conference, 2008Profit by Design - Mergers and Acquisitions as a Strategy for Growth2008
Lorman Education Services publicationBuilding Codes in Virgina2008
CMAA National Convention, 2008Managing the Risks of Design and Construction Defects2008
Lorman Education Services publicationHow Design Documents can Prevent or Cause Construction Claims in Virginia2006
National Electrical Contractors Association 95th Convention, 1996Maximizing Your Insurance Coverage1996
AIA Build Virginia Regional Convention, 1996 and Professional Environmental Marketing Association, 1997Negotiating The Contract Without Killing The Deal1996
Virginia Environmental Council, 6th Annual Convention, 1995The Application of Strict Liability for Work Practice Standards1995
AIA SW WA Chapter, 1994 and CEC/MW, NOVA AIA 1998DPIC Contract Review Workshop1994
Heavy Construction Contractors Association, 1994Partnering Seminar1994
American Society for Quality Control, AEC Division, 1994TQM and Design/Build: Controlling Liabilites1994
Wiley Law Publications"Ownership Transition." Design Professional's Handbook of Business and Law1993
Wiley Law Publications"Design Build" and "Partnering," Construction Joint Ventures1993
Co-Author, Wiley Law PublicationsConstruction Litigation Formbook1991
Northwest Design Seminar, 1991How Much Are We Worth?1991
National Asbestos Council, N.W. Reg. Conference, 1990Strategies for Managing Asbestos Liability in the 1990s1990
CSI Regional Conference, 1989-1990, and Build Virginia AIA Regional Convention, 1996-1997Gettting Paid1989
28th Annual Invited Attorneys Meeting sponsored by CNA Insurance Co., AIA and NSPE 1989Defending Architects & Engineers in Asbestos Litigation1989
ACEC Guidelines to PracticeRecordkeeping Guide for Design Firms1985
School NameMajorDegreeGraduated
Syracuse University College of LawLawJD - Juris Doctor1981
University of OregonArchitectureB.Arch1979