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Expert Witness Services

Comprehensive Expert Witness Services

From airport premises liability to dram shop litigation — 11 distinct service areas covering the full spectrum of cases involving commercial and public facility safety. Available for plaintiff and defense in all 50 states.

Service Areas

Expert Witnesses

States Served

P&D

Plaintiff & Defense

Premises…Airport…Slip…Moisture…Maintenance…Construction…ADA…OSHA…Dram…Airport…Video…

Premises Safety

Premises Liability Analysis

Slip, trip, and fall incidents in commercial and public facilities.

Expert analysis of the full chain of causation in premises liability cases — from the physical condition of the surface to the maintenance protocols in place at the time of the incident.

Paul Gaston

Licensed General Contractor · 30+ Years

Common Case Types

Slip and fall on wet, polished, or contaminated flooring

Trip and fall on uneven surfaces, transitions, or thresholds

Fall due to inadequate lighting or obstructed walkways

Injuries from improperly maintained floor surfaces

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Premises Safety

Airport & Transportation Facility Safety

The only expert witness with 17+ years of active operational experience at O'Hare International Airport.

Unmatched operational insight into airport construction, maintenance, and public area safety — drawn from 17+ years as General Foreman at O'Hare International Airport, one of the world's busiest aviation facilities.

Paul Gaston

General Foreman, O'Hare International Airport · 17+ Years

Airport & Transportation Facility Safety

Common Case Types

Slip and fall incidents in airport terminals, concourses, and gate areas

Injuries from HVAC condensation and moisture-related hazards

Construction defect cases in occupied terminal renovation zones

ADA violations in airport passenger facilities

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Premises Safety

Slip Resistance & Flooring Analysis

Coefficient of friction testing, surface material evaluation, and traction failure assessment.

Scientific and practical evaluation of flooring systems using established ASTM testing standards — covering polished concrete, tile, terrazzo, epoxy, and coated surfaces in commercial and public facilities.

Paul Gaston

Licensed General Contractor · OSHA 30-Hour Certified

Common Case Types

Slip and fall on polished, waxed, or sealed hard flooring

Cases involving tile, terrazzo, marble, or epoxy flooring systems

Incidents where cleaning products or sealers reduced traction

Wet condition slip cases in restrooms, kitchens, and entryways

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Premises Safety

Moisture & Condensation Hazard Analysis

HVAC imbalance, humidity migration, and environmental causes of slip hazards in commercial facilities.

Condensation-related slip hazards are among the most misunderstood — and most defensible — issues in premises liability litigation. Our analysis identifies the root cause of moisture hazards and establishes whether they were foreseeable and preventable.

Paul Gaston

Licensed General Contractor · HVAC & Facilities Expert

Common Case Types

Slip and fall caused by HVAC condensation on hard flooring

Cases involving tracked-in moisture at building entrances

Incidents in airport terminals with known condensation issues

Restroom and kitchen slip cases involving drainage failures

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Premises Safety

Maintenance & Inspection Failures

Forensic review of janitorial practices, inspection logs, and maintenance protocols.

A forensic gap analysis between a property owner's written maintenance policies and their actual practice — identifying where the duty of care was breached and when the hazard should have been discovered and corrected.

Paul Gaston

Licensed General Contractor · Facilities Management Expert

Common Case Types

Slip and fall cases where the hazard existed for an extended period

Cases involving inadequate inspection frequency in high-traffic areas

Incidents where maintenance logs show gaps or falsification

Cases involving third-party janitorial contractor failures

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Construction Safety

Construction Defect & Workmanship Analysis

Improper installation, building code violations, and unsafe construction practices in commercial and public facilities.

As an active Licensed General Contractor for the City of Chicago with 30+ years of hands-on construction experience, Paul Gaston evaluates construction quality, code compliance, and workmanship standards from a practitioner's perspective — not an academic one.

Paul Gaston

Licensed General Contractor, City of Chicago (#TGC131247)

Construction Defect & Workmanship Analysis

Common Case Types

Slip and fall caused by improperly installed flooring or transition strips

Trip and fall on uneven thresholds or door hardware defects

Fall from height due to non-compliant handrail or guardrail systems

Injuries from defective door hardware or malfunctioning closers

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Construction Safety

ADA & Accessibility Compliance

Walking surfaces, ramps, transitions, door hardware, and accessibility violations under the Americans with Disabilities Act.

Comprehensive evaluation of facilities against ADA Standards for Accessible Design, ICC/ANSI A117.1, and applicable local codes — providing clear, defensible opinions on whether violations contributed to the incident.

Paul Gaston

Licensed General Contractor · ADA Compliance Specialist

Common Case Types

Trip and fall on non-compliant transition strips or thresholds

Fall on ramp with excessive slope or inadequate edge protection

Injury from door with excessive opening force or non-compliant hardware

Cases involving accessible route obstruction or surface failures

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Construction Safety

OSHA & Safety Standards Evaluation

Authoritative opinions on which OSHA standards apply, how they should be interpreted, and whether violations occurred.

OSHA standards are frequently cited — and frequently misapplied — in premises liability and worker injury litigation. Paul Gaston's dual OSHA 30-Hour certification in both construction and general industry provides authoritative, credible opinions on OSHA applicability and compliance.

Paul Gaston

OSHA 30-Hour Certified — Construction & General Industry

Common Case Types

Worker injury cases involving alleged OSHA violations

Fall from height cases in construction and general industry

Cases involving inadequate PPE selection or provision

Lockout/tagout (LOTO) failure cases

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Hospitality & Dram Shop

Dram Shop & Alcohol Liability

Overservice, visible intoxication, underage service, and alcohol-related injury and death cases.

Ryan Dahlstrom and Preston Rideout together bring over 55 years of combined alcohol service expertise and 100+ state alcohol safety certifications to dram shop litigation — providing the most credentialed dram shop expert witness team available.

Ryan Dahlstrom & Preston Rideout

55+ Combined Years · 100+ State Certifications

Common Case Types

Dram shop cases involving overservice of visibly intoxicated patrons

DUI injury and death cases with dram shop liability

Underage alcohol service cases

Cases involving inadequate responsible service training

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Hospitality & Dram Shop

Airport Security & Crowd Control Analysis

Airport security protocols, crowd management in terminals, foreseeable risk assessment, and incident prevention.

Expert evaluation of security operations at airports and transportation facilities — assessing whether foreseeable risks were identified, whether security staffing and protocols met the applicable standard of care, and whether reasonable measures were in place to prevent harm to passengers and employees.

Ryan Dahlstrom

Airport Security & Crowd Control Expert · 35+ Years

Airport Security & Crowd Control Analysis

Common Case Types

Assault cases involving inadequate security in airport terminals or concourses

Use-of-force cases involving airport security guard conduct

Crowd crush and overcrowding injury cases at gates or checkpoints

Cases involving failure to identify or eject a known threat

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Hospitality & Dram Shop

Video Analysis & Incident Reconstruction

Surveillance footage review, timeline construction, and forensic incident reconstruction for litigation support.

Comprehensive compilation and analysis of surveillance footage to reconstruct the sequence of events in an incident — building frame-by-frame timelines, identifying key moments, and presenting findings in a format suitable for deposition and trial.

Ryan Dahlstrom

Founder, The Bar & Restaurant Experts · Video Analysis Specialist

Video Analysis & Incident Reconstruction

Common Case Types

Dram shop cases where video evidence shows patron intoxication level

Security incident cases where video reconstructs the use-of-force sequence

Slip and fall cases where video shows the hazard and the incident

Cases where video contradicts or supports witness testimony

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Retain an Expert

Don't See Your Case Type?

Our experts handle a wide range of premises liability, construction safety, and hospitality cases. CVs and prior testimony lists are available at no charge. Contact us to discuss whether we can assist with your specific matter.

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Initial Consultation

No charge

CVs & Testimony Lists

Available upon request

Plaintiff & Defense

Both sides retained

All 50 States

Nationwide availability