Luxury Goods & Collectibles Expert Witness

Jack Holowczak serves as an independent expert witness and litigation consultant in the forensic authentication and valuation of luxury handbags, designer goods, collectibles, and alternative assets. With over 10 years of hands-on experience and more than 2 million items examined across 50+ brands, he provides forensic analysis, written expert reports, and testimony for attorneys, insurers, and dispute resolution professionals, and is available for retention across all U.S. and Canadian jurisdictions.

He is the Founding Director of Provenance, a luxury authentication, appraisal, and advisory practice, and the Principal Product Architect of Veriul AI, a computer vision authentication platform for luxury goods. He holds an Honours BA from the University of Toronto with additional studies at the University of Oxford and is a published author of Provenance: The Business of Authenticating Luxury.

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For insurance, estate, donation, and tax-purpose valuations outside of litigation, see the personal property appraisal practice →

Areas of Expertise

Handbag & Leather Goods Authentication

Forensic examination of luxury handbags, small leather goods, ready-to-wear, accessories, footwear, and timepieces. Deep brand-specific expertise across Hermès, Louis Vuitton, Chanel, Dior, Gucci, Prada, Céline, Fendi, Balenciaga, Bottega Veneta, Goyard, Loewe, Saint Laurent, and 40+ additional houses.

Valuation & Appraisal

Fair market valuation of luxury handbags, collectibles, vintage designer items, watches, jewellery, and alternative assets for litigation, estate settlement, equitable distribution, insurance, and tax purposes. Appraisal reports prepared for attorney use and court submission.

Counterfeit & Superfake Detection

Identification and forensic documentation of counterfeit, "superfake," and misrepresented luxury handbags and goods. Analysis of stitching density, material composition, hardware provenance, heat stamp characteristics, date codes, dust bag markings, and manufacturing indicators.

Industry Standards & Practices

Expert opinion on authentication industry standards, resale marketplace practices, consignment operations, and the secondary luxury handbag and collectibles market. In customs detention and seizure matters, the practice furnishes authenticity examination and value of the genuine article to counsel.

Brand-Specific Expertise

Handbags & Leather Goods

Hermès Louis Vuitton Chanel Dior Gucci Prada Céline Fendi Balenciaga Bottega Veneta Goyard Loewe Saint Laurent Givenchy Valentino Miu Miu Burberry Mulberry Coach Loro Piana Mansur Gavriel Jacquemus Polène Wandler BY FAR A.P.C. Staud

Watches & Fine Jewellery

Rolex Patek Philippe Audemars Piguet Omega Cartier IWC Jaeger-LeCoultre Panerai Tudor TAG Heuer Hublot Breitling Richard Mille Van Cleef & Arpels Tiffany & Co. Bulgari Chopard

Streetwear & Contemporary

Chrome Hearts Off-White Supreme Stone Island Moncler Amiri Palm Angels Fear of God Essentials Rhude Kith Acne Studios Maison Margiela Rick Owens Canada Goose

Credentials & Qualifications

10+ Years, 2M+ Items Examined — Over a decade of hands-on authentication work covering more than 2 million luxury handbags, goods, and collectibles across 50+ brands and asset classes.

Founding Director, Provenance — Operates an active luxury authentication, appraisal, and advisory practice serving private collectors, insurers, estates, and resale platforms.

University of Toronto (Honours BA) & University of Oxford — Honours BA from the University of Toronto, with additional studies at the University of Oxford.

Published Author — Provenance: The Business of Authenticating Luxury, a professional reference on luxury authentication, valuation, and expert-witness practice.

Listed Expert Witness — SEAK, JurisPro, Expert Institute, ForensisGroup & Others — Listed on multiple expert witness directories and referral networks serving the legal profession.

Current Engagement — Presently retained in active litigation in Los Angeles County.

Curriculum Vitae — Full professional CV.

Download CV (PDF)

Representative Case Types

Counterfeiting & Fraud Litigation — Civil and criminal matters involving the sale, distribution, or possession of counterfeit or superfake luxury handbags, goods, and collectibles.

Insurance Claims — Authentication and valuation for theft, loss, and damage claims involving luxury handbags, personal property, collectibles, and alternative assets.

Estate & Divorce Proceedings — Fair market valuation of luxury handbag collections, goods, and collectibles for equitable distribution, estate settlement, and probate matters.

Consumer Protection & Misrepresentation — Cases involving misrepresentation, deceptive trade practices, and authenticity disputes on resale platforms and marketplaces.

Customs & Trade Disputes — Authenticity and valuation determinations for luxury goods in customs and cross-border matters.

Small Claims & Arbitration — Flat-fee authentication and valuation reports for lower-value disputes requiring independent expert opinion.

Services & Fee Schedule

Non-Testimony Services

$450 / hr

Case consultation, forensic authentication reports, written valuation analysis, appraisal reports, document review, and deposition preparation. Billed in 1/10th hour increments.

Testimony Services

$550 / hr

Deposition testimony, trial testimony, arbitration testimony, and mediation support. Billed in 1/10th hour increments. Travel time and expenses billed separately.

Standard retainer: $3,000. Deposition minimum: 4 hours; trial minimum: full day. Flat-fee engagements available for defined-scope matters. Cancellation terms are documented in the engagement letter. Fees are never contingent on findings or appraised value.

Representative Matter Types

Collectibles & Memorabilia. Authentication methodology, provenance assessment, and fair market valuation in disputes involving collectibles and memorabilia, applying documented markers and comparable-sales analysis from primary auction records.

Counterfeit Product Matters. Civil matters involving alleged counterfeit luxury goods — consumer claims, resale platform disputes, insurance and customs contexts — through forensic examination of construction, materials, hardware, and documentation against authenticated exemplars.

Estates, Trusts & Fraud. Authenticity and valuation questions arising in estate, trust, and fraud matters, including misrepresentation claims involving luxury goods, fine art, and collections. For non-resident estates holding U.S.-situs property, see Form 706-NA appraisals.

Theft, Burglary & Contents Losses. Replacement and fair market value analysis of stolen, destroyed, or damaged personal property — jewelry, watches, handbags, collections — reconstructed from documentation for insurance claims, policy appraisal proceedings, arbitration, and litigation; retained by policyholders' counsel and by carriers. Post-loss methodology is detailed on the insurance loss and theft claim valuations page. Includes party-appointed appraiser roles under policy appraisal provisions and review of claimed contents values.

Methodology & Report Standards

Documentation-Driven Examination — Examination is record-based: photographs, receipts, provenance records, and prior documentation, with physical examination where arranged with counsel. Markers are compared against authenticated exemplars, and the scope of work and any assumptions are disclosed in the report.

Comparable Sales from Primary Records — Valuations are grounded in documented comparable sales from primary auction records (Heritage Auctions, Sotheby's, Christie's, Bonhams, Phillips, Heffel, Cowley Abbott) and licensed databases.

USPAP Standards 7 & 8 — Reports state intended use and intended users, the type and definition of value, the effective date, the scope of work, and the appraiser's certification.

Independence — Fees are never contingent on findings or outcome. The analysis is the same whether retained by plaintiff or defense counsel, by policyholders' counsel, or by carriers.

How an Engagement Proceeds

Inquiry and conflict check.
Engagement letter and the $3,000 standard retainer before materials are reviewed.
Materials provided through counsel.
Examination and written report.
Deposition and trial billed under the fee schedule.

Collectibles, Memorabilia & Watch Disputes

Collectibles Valuation — Fair market and replacement value opinions for collectibles in dispute — design objects, classic and collector cars, fine wine and spirits, vintage workwear and heritage clothing, and pieces with auction-house provenance — developed from documented comparable sales in primary auction records (Heritage Auctions, Sotheby's, Christie's, Bonhams, Phillips) and licensed databases. Each comparable relied upon is identified in the report.

Provenance Assessment — Review of the documentary chain behind an item — receipts, prior appraisals, auction records, correspondence, and photographs — with gaps, inconsistencies, and assumptions stated plainly rather than resolved by inference.

Memorabilia — Valuation Only — Sports and entertainment memorabilia is valued from market evidence for comparable items. Autograph, game-use, and trading-card authentication are distinct disciplines performed by third-party authenticators and are not offered; where an item's value rests on such a determination, the report states the assumption and its source.

Watches — Rolex, Patek Philippe, Audemars Piguet, Cartier, Omega, and other houses are authenticated against brand markers — case, dial, bracelet, and accompanying papers — and valued from retail and secondary-market evidence. Movement servicing and horological repair are not offered.

Frequently Asked Questions

Do you authenticate all luxury handbag brands?

Yes, across 50+ houses. Primary expertise covers Hermès (Birkin, Kelly, Constance), Louis Vuitton, Chanel, Dior, Gucci, Prada, Céline, Fendi, Balenciaga, Bottega Veneta, Goyard, Loewe, Saint Laurent, and others. See the full brand list above.

Are you available outside of Canada?

Yes. Available for matters in all U.S. and Canadian jurisdictions. Remote consultation and written opinion are available in all locations; in-person testimony available nationwide with travel billed separately.

How quickly can you respond to a new matter?

Initial inquiries receive a prompt reply. Report timelines depend on matter scope and are confirmed in the engagement letter.

Do you provide written appraisal reports suitable for court, insurance, or tax submission?

Yes. USPAP-compliant personal property appraisal reports (Standards 7 & 8) are prepared for insurance scheduling, estate and divorce equitable distribution, Canadian deemed-disposition (CRA fair market value at death), charitable donation, and litigation purposes. Forensic authentication reports are prepared for attorney use, court submission, customs matters, and consumer protection actions, with full methodology documentation and credentials disclosure. Full appraisal practice details and engagement intake are also available on the dedicated practice page.

How do I retain Jack Holowczak as an expert witness?

Send a message via the contact form below to discuss the matter. If it falls within my areas of expertise, an engagement letter and retainer agreement are executed prior to commencement of work.

What is Jack Holowczak's professional background?

Over 10 years of hands-on experience and more than 2 million items examined across 50+ brands. Founding Director of Provenance, a luxury authentication, appraisal, and advisory practice. Principal Product Architect of Veriul AI, a computer vision authentication platform for luxury goods. USPAP-compliant personal property appraiser. Honours BA from the University of Toronto with additional studies at the University of Oxford. Author of Provenance: The Business of Authenticating Luxury.

What are Jack Holowczak's expert witness fees?

Non-testimony work (reports, consultation, valuation) is billed at $450 per hour. Testimony work (deposition, trial, arbitration) is billed at $550 per hour. Standard retainer is $3,000. Deposition engagements have a 4-hour minimum and trial engagements have a full-day minimum. Cancellation terms are documented in the engagement letter. Fees are never contingent on findings or appraised value.

Do you serve as a collectibles expert witness?

Yes. Valuation and provenance opinions are grounded in comparable sales from Heritage Auctions, Sotheby's, Christie's, Bonhams, Phillips, and licensed databases, with each comparable documented in the report.

Do you serve as a memorabilia expert witness?

For valuation and market-practice questions, yes. Autograph and game-use authentication is a distinct discipline and is not offered.

What does a counterfeit products expert witness do in a civil matter?

The expert examines each item against authenticated exemplars — construction, materials, hardware, and documentation — states the basis of every finding, and, where asked, opines on the retail and fair market value of the genuine article. How those findings enter the case is for counsel.

Can you review or rebut an opposing expert's valuation or authentication report?

Yes. Appraisal review is a distinct assignment under USPAP Standards 3 and 4: the report's methodology, comparable-sales support, standard of value, and conformity are examined, and an independent opinion of value is provided where the engagement calls for one.

Can you value items as of a past date, such as a date of loss, date of death, or date of separation?

Yes. Retrospective effective dates are standard appraisal practice; value is developed from market evidence for that date and the effective date is stated in the report.

Do you use AI to authenticate?

Veriul AI, a computer vision authentication platform for luxury goods, may be used as a screening instrument where appropriate. Every opinion rests on the principal's own forensic examination of construction, materials, hardware, and documentation, and the report states what was examined and how.

Professional Directory Listings

Listed on the following expert witness directories and referral networks:

Retain an Expert

For case inquiries, engagement letters, or to discuss whether your matter falls within my areas of expertise, send a message below.

Prefer email? jack@jackholowczak.com. Please do not include privileged detail before an engagement letter is in place.

Available for matters in all U.S. and Canadian jurisdictions. Based in Toronto, ON.