GCM Group - Expert Witness and Litigation Support Services

GCM Group - Expert Witness and Litigation Support Services

Professional headshot of a middle-aged man with short gray hair, blue eyes, and a friendly smile, wearing a black shirt, photographed against a plain blue background.

Clarity before Conflict

Helping owners, contractors, and counsel untangle schedules, costs, and liability — so you can decide fast and negotiate from strength.

I’m Walter McBrier, founder of GCM Group. I’ve spent nearly 20 years in construction — from field operations and VP roles to global cost management for complex lab and office projects.

I help clients make sense of schedules, change orders, and cost data, then turn that insight into clear, defensible positions for negotiations, mediations, and court. If your project is slipping — or your matter is heating up — I’ll get you the clarity you need, fast.

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Why Clients Trust GCM Group

  • 20 years in construction: field → VP → global cost controls

  • Specialties: schedule analysis (TIAs, concurrency), change orders, cost review

  • Deliverables: timeline visuals, claims analysis, expert-style reports, testimony support

  • Sectors: commercial, lab/office, tenant improvements, infrastructure

  • Location: Based in Boise, Idaho • Available nationwide (remote or on-site)

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Core Services

Schedule Analysis

As-planned vs. as-built, impacts, concurrency, and Time Impact Analyses.

Change Orders

Entitlement, quantum, pricing checks, documentation review.

Litigation Support

Clear exhibits, expert-style opinions, deposition and trial preparation.

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When I’m not in the data, you’ll find me on a gravel ride, in the mountains, or on the river with my kids. That love of the outdoors shows up in my work: straightforward, steady, and built to last.

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Need clarity—quickly?

Send me your docs. I’ll pinpoint the issues, outline your options, and help you move forward with confidence.

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Schedule a consult

  • Email: waltm@globalcostmanagement.com

  • Phone: (208) 996-9896

  • Location: 718 w Ada St, Boise, Idaho 83702