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Throughout his career Expert has been recognized as a leader in the industry. This is demonstrated by the wide range and number of groups within the field that call on him to lecture, conduct seminars, write, chair in related areas and serves on many technical committees. These include CSI, ASTM, National Association of Tile Contractors (NTCA) Tile Contractors of America (TCAA) Ceramic Tile Institute (CTI,) Tile Council of North America [TCA] as well as conducting technical seminars nationally for American Olean Tile Co. He holds several patents relative to the construction industry. He is a member of the American Board of Forensic Examiners, American Bar Association [ABA], American Arbitration Association [AAA]; He is a trained Arbitrator and Mediator and is a Mediator for the New York School Construction Authority [NYSCA].The services of GZA are available nationally and globally. Expert serves the Tile Council of North America [TCNA] as an expert/inspector in their Team USA program as well as being a recommended expert by the National Tile Contractors Ass'n [NTCA].

Construction consultation and expert witnessing involves working with architects, engineers, public agencies, owners, developers, co‑op and condo boards, realtors, the insurance industry and the legal profession. The consultant often faces the difficult question‑how to bridge the gap between being viewed as a problem maker by the opponent and a problem solver by the client. The client in one matter may be the adversary in another. To work with both sides to effectively get the job done takes the kind of experience and knowledge Expert imparts on his clients.

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