What Interface Consulting International does

Interface Consulting International, founded in 1986 in Houston, Texas, is an engineering and construction consulting firm specializing in construction claims, dispute resolution, and litigation support services. Operating today as the engineering & construction consulting practice of GlassRatner Advisory & Capital Group, the firm serves owners, contractors, law firms, engineering firms, insurers, lenders, and private equity investors involved in complex capital projects across oil & gas, refining, LNG, power, petrochemical, healthcare, transportation, and government sectors. Its service portfolio spans six interconnected core areas: Construction Claims & Disputes, Construction Defects, CPM Schedule Analysis, Construction Management advisory, Litigation & Arbitration support, and Project Advisory, complemented by specialized offerings such as Construction Management Standard of Care Evaluation and Occupational Injury/Incident Analysis. Delivery is anchored by a team of credentialed experts (PEs, PMPs, PSPs, CPAs) with decades of hands-on industry experience at major energy operators and engineering firms.

The firm employs proprietary, standards-grounded analytical methodologies rather than technology platforms. Core frameworks include Critical Path Method (CPM) Schedule Analysis (Windows Analysis, Time Impact Analysis, Collapsed As-Built, Impacted As-Planned, As-Planned vs. As-Built), Measured Mile and MCAA Factors labor productivity quantification, and a Construction Management Standard of Care Evaluation covering 15 PMI PMBOK knowledge areas. Revenue is earned through project-based professional services fees — billable consulting hours and fixed-fee engagements scoped to case complexity — sold via direct enterprise field sales led by senior principals, with lead generation supported by ABA Forum publications, industry conference sponsorships, and thought leadership distribution.

Following the June 27, 2025 acquisition by TorQuest Partners from B. Riley Financial, the firm operates as GlassRatner with approximately 200 team members across 12+ offices in the US, Canada, and Mexico, supported by a global delivery partnership with BTG Global Advisory. The firm claims 1,200+ engagements on $100B+ of cumulative capital project value across its 40-year operating history.

Name

Interface Consulting International

Legal name

Interface Consulting International, Inc.

Website

https://interface-consulting.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

11–50 employees

Short description

Interface Consulting International, operating as the construction consulting practice of GlassRatner, is a Houston-based engineering and construction consulting firm providing construction claims, expert witness, litigation support, and project advisory services to owners, contractors, law firms, and financial institutions across capital-intensive industries worldwide.

Ownership category

akta.pro rank

Product category

Construction Consulting Services

NAICS

Other Scientific and Technical Consulting Services (54169), Management Consulting Services (54161)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Industrial & Process Engineering Consulting (BPAHAIAF)

Keywords

• Construction claims consulting
• Expert witness services
• Construction dispute resolution
• CPM schedule analysis
• Project advisory services

Headquarters

HQ city

Houston

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Professional Consulting Services: Project-based professional services fees for construction consulting, expert witness, litigation support, and advisory engagements. Revenue is earned through billable consulting hours and fixed-fee project engagements with law firms, owners, contractors, and financial institutions.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Interface Consulting International (operating under the GlassRatner brand) provides expert construction consulting, claims analysis, and dispute resolution services to owners, contractors, law firms, and financial institutions. The firm delivers expert witness testimony, forensic CPM schedule analysis, labor productivity analysis, construction management standard of care evaluations, and project advisory services across capital-intensive industries including oil and gas, power, refining, infrastructure, healthcare, and megaprojects.

Product overview

GlassRatner (formerly Interface Consulting International) is a professional consulting firm providing a portfolio of expert construction consulting services. The firm operates as a service-based consultancy rather than a software platform, offering six interconnected core service areas: Construction Claims & Disputes, Construction Defects, Construction Management, CPM Schedule Analysis, Litigation & Arbitration, and Project Advisory services. These services are delivered through highly qualified construction experts and consultants who provide analysis, expert testimony, and advisory support to owners, contractors, attorneys, engineers, insurers, and suppliers involved in the engineering and construction process. The firm specializes in dispute resolution, claims preparation, schedule delay analysis, and construction management standard of care evaluations across diverse industry sectors including buildings, transportation, oil & gas, marine, power, and chemical/petrochemical.

Differentiator

Problem solved

Functional benefit

Products and services

• Construction Claims & Disputes Expert analysis and consulting for construction claim preparation, dispute resolution, and claims management covering delay, labor productivity, design defects, force majeure, acceleration, suspension/termination, differing site conditions, and change claims. For owners, contractors, attorneys, and insurers.
• Construction Defects Expert analysis services for construction defect claims and disputes, examining design and construction deficiencies and their causes. For attorneys, owners, and contractors involved in defect litigation.
• Construction Management Consulting Professional construction management consulting services addressing contract administration, work scope management, schedule analysis, process implementation, risk management, change management, and project controls to resolve problems arising from complex project execution. For owners and contractors on large capital projects.
• CPM Schedule Analysis Critical Path Method schedule analysis services including Windows Analysis, Time Impact Analysis (TIA), Collapsed As-Built, Impacted As-Planned, and As-Planned vs. As-Built methodologies for delay analysis and claims preparation. For attorneys and parties in construction delay disputes.
• Litigation & Arbitration Support Expert witness and dispute resolution support services including prudence evaluation, international arbitration support, labor productivity analysis, schedule delay expertise, damage quantification, and expert testimony for construction litigation and arbitration proceedings. For law firms, owners, and contractors.
• Project Advisory Comprehensive construction advisory services including bid and proposal analysis, contract review, project delivery evaluation, budgeting and cost management, risk management, drawing and specification review, procurement strategy, labor productivity analysis, and change management. For owners, EPC contractors, and developers.
• Construction Management Standard of Care Evaluation Expert analysis evaluating construction management standard of care using PMI PMBOK standards, assessing preparation, planning, and execution performance across 15 key construction management elements. For attorneys, owners, and contractors in standard of care disputes.
• Occupational Injury/Incident Analysis Expert analysis services for workplace injury and incident investigations in construction settings. For attorneys, owners, and contractors involved in personal injury and HSE disputes.

Quantifiable outcome

• 40+ years in operation since 1986; 550+ clients served; 1,200+ projects completed; $100B+ in capital projects worked on
• +2 more outcomes

Named customers22 records

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• BTG Global AdvisorycoreStrategic or Co-development PartnerGlassRatner offers seamless advisory services globally through its partnership with BTG Global Advisory. This partnership enables the firm to provide international coverage beyond its North American office network.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Ankura Consulting: Ankura's Construction Expert Services practice provides CPM schedule analysis, claims consulting, and expert testimony across capital projects - overlapping directly with GlassRatner's litigation & arbitration and schedule analysis offerings.
• Huron Consulting Group: Huron's Business Advisory practice includes capital project advisory, construction claims, and disputes services for owners, contractors, and law firms - directly comparable to GlassRatner's project advisory and claims work.
• Rimkus Consulting Group: Rimkus (which acquired Capital Consulting International, where Aycardo worked) provides forensic delay analysis and construction consulting - directly overlapping schedule/labor-productivity expert services.
• Long International: Long International is a construction claims and dispute resolution consultancy specializing in schedule delay analysis, productivity, and expert testimony - the same core offering as Interface/GlassRatner and a direct talent competitor (Gunter himself came from Long).
• Secretariat Advisors: Secretariat is a global expert services firm providing construction delay/dispute, damages, and quantum analysis - a comparable boutique expert witness and construction disputes firm.

Broad incumbents

• FTI Consulting: FTI's Construction Solutions practice (including the legacy Navigant team) provides construction claims, schedule, and damages services with a much larger global bench - a clear incumbent competitor on large disputes.
• BDO USA (Forensic & Advisory): BDO's Forensic Litigation and Construction Advisory services compete with GlassRatner's dispute and damages practice across mid-market and enterprise construction matters.
• Deloitte Advisory (Transactions & Business Analytics): Deloitte's Forensic and Capital Projects practices offer schedule analysis, construction claims, and contract advisory; competes for the same law firm engagements as part of a much broader portfolio.
• Kroll: Kroll's Disputes and Investigations practice includes construction claims, delay analysis, and expert services for litigation, sharing the same law firm and owner clients as GlassRatner.
• Alvarez & Marsal: A&M's Disputes and Economics practice offers construction claims, expert witness, and damages quantification services; broader firm but directly competes on schedule delay, productivity, and quantum disputes.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/Interface_Intl
• LinkedInlinkedin.com/company/interface-consulting-international-inc-
• Facebookfacebook.com/InterfaceConsultingIntl

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Interface Consulting International