Construction Delay, CPM & Cost Expert Witness

Specialties & Experience of this Expert Witness

Additional Information

Walter McBrier is a construction expert witness and Licensed Professional Engineer (P.E., Civil — Idaho) with nearly 25 years of hands-on construction experience. He founded GCM Group LLC on a single principle: Clarity Before Conflict. His practice focuses on construction delay analysis, CPM schedule forensics, cost damages, change order disputes, differing site conditions, and expert testimony in state and federal litigation, arbitration, and mediation across the western United States. What Makes GCM Group Different When you retain GCM Group, you get Walter McBrier personally — not a junior analyst. Walter has been in the fire. As Vice President / Project Director at McAlvain Construction, he managed complex commercial projects, negotiated multimillion-dollar change orders, and worked through significant construction disputes from the inside. That lived experience allows him to read a project record the way only someone who has actually run jobs can. His methodology is document-first. He withholds judgment until the contemporaneous record speaks — drilling through daily reports, RFIs, change order histories, and CPM schedule updates to find the evidence that tells the true story. He has found case-defining facts buried deep in handwritten subcontractor daily reports that no one else bothered to read. He acknowledges unfavorable findings deliberately. Nobody on a construction project is ever completely clean — and honest, objective analysis is the foundation of credible expert testimony. Areas of Expertise Construction Delay & Schedule Analysis: Forensic schedule analysis, Critical Path Method (CPM), Time Impact Analysis (TIA), Window Analysis, As-Planned vs. As-Built, Collapsed As-Built, and But-For Analysis. Primavera P6 and Microsoft Project. Cost Forensics & Damages: Cost estimating, quantification of cost overruns, change order entitlement, productivity loss analysis, and extended general conditions. Change Orders & Claims: Evaluation of complex change orders, entitlement assessments, and disputes exceeding $10M in value. Contract & Dispute Resolution: Contract interpretation, subcontractor disputes, differing site conditions, acceleration claims, and standard of care analysis. Career Highlights GCM Group LLC — Founder & Principal Expert: Construction expert witness in state and federal litigation and arbitration; supported resolution of disputes involving claims exceeding $10M. Cushman & Wakefield / Micron Technology — Global Cost Manager: Led cost, schedule, and contract oversight across a $500M+ semiconductor capital portfolio spanning the U.S., Japan, Taiwan, India, Spain, and Italy. McAlvain Construction — Vice President / Project Director: Directed delivery of complex commercial, civil, hospitality, and infrastructure projects including hospitality hotels, civic spaces, student housing, bridges, and dams across Idaho. SunCor Development — Site Development Manager: First boots on the ground for Avimor, Idaho's first master-planned community. Managed 700,000+ CY of grading, roads, wastewater treatment, and utilities. Peter Kiewit & Sons — Project Engineer / Manager: Heavy civil infrastructure including dams, flood control, and water treatment in Southern California. Credentials Licensed Professional Engineer (Civil) — State of Idaho Member, AACE International — Member ID 465322 B.S. Mechanical Engineering — Montana State University Primavera P6 • Microsoft Project • Power BI • Bluebeam • AutoCAD