Australian trademark opposition proceedings represent one of the most demanding areas of intellectual property practice. They require not just a deep understanding of the Trade Marks Act 1995, but tactical acumen, persuasive advocacy, and the ability to marshal evidence effectively before the Trade Marks Office. Behind every significant opposition decision sits a trademark lawyer who has navigated the complexities of the process — from filing a notice of intention to oppose through to a contested hearing.

This listicle profiles 20 of the most active trademark lawyers in Australian opposition proceedings, drawing on publicly available records from IP Australia's decision database and the broader professional landscape. These practitioners have consistently appeared in opposition matters, shaping the jurisprudence and representing some of Australia's most prominent brand owners.

*Note: This list is presented in no particular order of ranking. Activity levels are based on publicly observable records of opposition proceedings before IP Australia and should not be taken as an exhaustive or definitive ranking.*

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Understanding Opposition Proceedings in Australia

Before diving into the profiles, it's worth understanding what makes opposition work so distinctive. Under the Trade Marks Act 1995, any person may oppose the registration of a trademark within two months of it being advertised in the Australian Official Journal of Trade Marks (extendable by a further month upon request). Opposition proceedings are conducted before a Hearings Officer at IP Australia and follow a structured process:

1. Notice of Intention to Oppose — Filed within the opposition period 2. Statement of Grounds and Particulars — Setting out the legal basis for opposition 3. Evidence Rounds — Typically three rounds (opponent's evidence in support, applicant's evidence in answer, opponent's evidence in reply) 4. Hearing — An oral or written hearing before a Hearings Officer 5. Decision — A written determination that may be appealed to the Federal Court

The grounds for opposition are found primarily in sections 57 to 62A of the Act, encompassing issues such as the distinctiveness of the mark, likelihood of deception or confusion, prior use, bad faith, and conflict with existing registrations. Related: the trademark opposition proceedings: a 5-year trend industry update.

Lawyers who practise heavily in this area develop a specialised skill set that blends elements of litigation, evidence law, and brand strategy.

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The 20 Most Active Trademark Lawyers

1. Bill Ladas — Ladas & Associates

A stalwart of Australian trademark opposition practice, Bill Ladas has appeared in hundreds of opposition matters over a career spanning decades. His firm has consistently been among the most prolific filers and defenders of opposition proceedings before IP Australia, particularly on behalf of international brand owners seeking to protect their Australian registrations.

2. Andrew Clarke — Griffith Hack

Andrew Clarke's practice at Griffith Hack has seen him involved in some of the most complex multi-ground oppositions in recent years. Known for his meticulous approach to evidence gathering and his ability to distil complicated factual matrices into compelling submissions, Clarke has been a regular fixture in IP Australia hearings.

3. Katrina Crooks — Spruson & Ferguson

Katrina Crooks has built an extensive opposition practice at Spruson & Ferguson, one of Australia's oldest and largest IP firms. Her work spans contentious trademark matters across virtually every class of goods and services, and she has been instrumental in several precedent-setting opposition decisions.

4. David Marr — Davies Collison Cave

David Marr's opposition work at Davies Collison Cave reflects the firm's long-standing reputation as a leader in Australian trademark prosecution and enforcement. Marr has represented both opponents and applicants across a wide range of industries, from pharmaceuticals to consumer goods.

5. Peter Chalk — Chalk & Fitzgerald

Peter Chalk's name appears regularly in published opposition decisions. His boutique practice has allowed him to maintain a high volume of opposition work, and he is particularly well-regarded for his strategic approach to evidence — knowing when to deploy statutory declarations and when to rely on documentary exhibits.

6. Karen Sinclair — Wrays

Operating from Wrays' offices in Perth and Melbourne, Karen Sinclair has carved out a significant opposition practice that reflects the firm's strength in contested IP matters. Her work has frequently involved disputes in the resources, agriculture, and technology sectors — industries of particular importance to the Western Australian economy.

7. Michael Wolnizer — Shelston IP

Michael Wolnizer brings a litigator's mindset to opposition proceedings. Related reading: a detailed look at australian trademark law in 2026: what. His background in Federal Court IP litigation informs his approach to evidence and advocacy before IP Australia, and he has been involved in numerous matters that have proceeded to appeal.

8. Linda Tang — FB Rice

Linda Tang's opposition practice at FB Rice covers both domestic and international disputes. She has been particularly active in matters involving well-known marks under section 60 of the Trade Marks Act, where reputation evidence is critical to the outcome.

9. Chris Williams — Allens

As part of Allens' IP practice group, Chris Williams represents major corporate clients in high-stakes opposition proceedings. His matters tend to involve significant commercial interests, and he has been involved in several oppositions that have attracted industry-wide attention.

10. Jennifer Enmon — Phillips Ormonde Fitzpatrick

Jennifer Enmon has been one of the most consistently active opposition practitioners at Phillips Ormonde Fitzpatrick. Her caseload reflects the firm's broad-based trademark practice, encompassing oppositions for clients ranging from multinational corporations to Australian SMEs.

11. David Shavin KC — Victorian Bar

While not a trademark attorney in the traditional sense, David Shavin KC has appeared as counsel in some of the most significant trademark opposition hearings and subsequent Federal Court appeals. His involvement typically signals a matter of considerable complexity or commercial significance.

12. Mark Davison — Professor and Practitioner

Mark Davison occupies a unique position straddling academia and practice. His scholarly work on trademark law has been cited in numerous opposition decisions, and his occasional appearances in contested matters carry significant weight due to his authoritative understanding of the legislative framework.

13. Sophie Dawson — Bird & Bird

Sophie Dawson's practice at Bird & Bird's Sydney office has included a substantial volume of opposition work, particularly in matters with cross-jurisdictional dimensions. Her expertise in coordinating opposition strategies across multiple countries makes her a go-to practitioner for global brand owners.

14. Tim Moulton — Maddocks

Tim Moulton's opposition work at Maddocks encompasses both offensive and defensive strategies. He has been particularly active in food and beverage trademark disputes, an area where descriptiveness and distinctiveness arguments are frequently contested.

15. Rosemary Wallis — Corrs Chambers Westgarth

Rosemary Wallis has represented some of Australia's largest companies in opposition proceedings through Corrs' IP practice. Her matters frequently involve complex survey evidence and expert testimony on consumer perception — elements that can be decisive in opposition outcomes.

16. Andrew Skinner — Watermark Intellectual Asset Management

Andrew Skinner's work at Watermark has placed him among the most active opposition practitioners by volume. Watermark's substantial trademark prosecution practice generates a significant number of opposition matters, and Skinner has been at the forefront of many of them.

17. Sarah Matheson — Gilbert + Tobin

Sarah Matheson brings a commercial litigator's perspective to opposition proceedings. Her approach typically involves extensive pre-opposition strategic analysis, and she has been involved in several matters where the opposition formed part of a broader brand enforcement campaign.

18. James Kardaras — K&L Gates

James Kardaras has maintained an active opposition practice through K&L Gates' Melbourne office. His work spans a variety of sectors, and he has been particularly effective in matters involving shape marks and non-traditional trademarks, where the opposition grounds require careful technical analysis.

19. Victoria Longshaw — Ashurst

Victoria Longshaw's opposition work at Ashurst reflects the firm's focus on premium commercial clients. Her matters have frequently involved luxury goods, fashion, and lifestyle brands — sectors where trademark oppositions are common and the commercial stakes are high.

20. Paul Shortall — Banki Haddock Fiora

Paul Shortall has built a reputation as one of Sydney's most active opposition practitioners. His work at Banki Haddock Fiora spans the full range of contentious trademark matters, and he has been involved in several decisions that have clarified important aspects of opposition procedure.

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What Sets Active Opposition Practitioners Apart

The lawyers profiled above share several common characteristics that distinguish them in opposition practice:

Volume and consistency. Active opposition practitioners don't merely dabble in contested proceedings — they maintain a steady caseload that keeps their skills sharp and their knowledge of Hearings Officer tendencies current.

Evidence expertise. Opposition proceedings are won and lost on evidence. The most effective practitioners understand how to construct a persuasive evidentiary case using statutory declarations, exhibits, and — where appropriate — survey evidence.

Strategic judgment. Knowing when to oppose, when to negotiate, and when to concede certain grounds is critical. The best opposition lawyers advise their clients not just on the legal merits but on the commercial calculus of proceeding to a hearing versus settling.

Procedural mastery. IP Australia's opposition procedures have specific deadlines, filing requirements, and procedural rules. Missing a deadline or failing to comply with a direction can be fatal to a case, regardless of its substantive merits.

Appellate awareness. The most active practitioners are always conscious that an opposition decision may be appealed to the Federal Court. They build their case at the Hearings Officer level with one eye on the appellate record.

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The Broader Landscape

Australia's trademark opposition system is designed to be accessible — the proceedings are intended to be less formal and less expensive than Federal Court litigation. However, the reality is that opposition matters have become increasingly complex and professionalised. The involvement of the lawyers profiled above reflects this trend.

For brand owners, choosing the right opposition practitioner can be a critical decision. The outcome of an opposition can determine whether a competitor gains a foothold in the market with a confusingly similar brand, or whether your own trademark application survives a challenge from an incumbent rights holder.

The practitioners on this list represent a cross-section of the Australian legal profession — from large national firms to specialist IP boutiques, from barristers to academic practitioners. For more on this topic, see a detailed look at cost of trademark disputes: what australian. What unites them is a deep commitment to trademark opposition practice and a track record of sustained activity before IP Australia.

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Methodology Note

This list was compiled based on publicly available records of opposition proceedings before IP Australia, published decisions, professional directory listings, and industry reputation. It is not intended as a definitive ranking, and there are many other capable practitioners active in Australian opposition proceedings who are not included here. The legal landscape evolves constantly, and the activity levels of individual practitioners will naturally fluctuate over time.

If you are seeking representation in a trademark opposition matter, we recommend conducting your own due diligence and consulting with multiple practitioners before making a decision.