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O'Loughlin Westhoff
Jonathan O'Loughlin cover
Jonathan O'Loughlin

Jonathan O'Loughlin

Principal O'Loughlin Westhoff

Sydney, NSW
Contact us

About Jonathan

Jonathan O'Loughlin is the principal and founder of O’Loughlin Westhoff, established in 2017. With a vast legal career characterised by high-profile roles, Jonathan brings a wealth of knowledge in both regulatory and commercial litigation. His expertise is particularly pronounced in handling ASIC investigations and disputes, drawing on his deep experience from working on both defensive and prosecutorial sides of such cases. Jonathan’s capabilities extend to financial services, taxation disputes, and insolvency matters, making him a versatile figure in commercial law. His diverse educational background includes a Bachelor of Medical Science, a Juris Doctor, and a Master of Law (Taxation), which provide a strong foundation for his specialised legal insights. Jonathan is admitted to practice in the New South Wales Supreme Court, Federal Court, and High Court of Australia, allowing him to represent clients at the highest levels. Before founding his own firm, Jonathan held significant legal roles, including as a Senior Associate at William James and a lawyer for ASIC. His experience at PricewaterhouseCoopers Legal and Argyle Lawyers allowed him to develop strong skills in tax controversy, advising a range of clients from small businesses to high net worth individuals. Early in his career, Jonathan honed his litigation skills at the NSW Crown Solicitor's Office, representing the State of NSW in various legal matters. Outside his legal practice, Jonathan is passionate about ultra-marathon running, where he has excelled at an international level, including representing Australia at the World Championships in 2016.

Practice areas

Litigation & Disputes

Resume

Experience

Owner

Owner

O'LOUGHLIN WESTHOFF

Jun 2017 - Present • 9 years 4 months

Principal

Principal

O'Loughlin Westhoff

May 2017 - Present • 9 years 5 months

Senior Associate

Senior Associate

William James

Feb 2015 - Jun 2017 • 2 years 4 months

Lawyer

Lawyer

ASIC

Mar 2012 - Feb 2015 • 2 years 11 months

Senior Solicitor

Senior Solicitor

PricewaterhouseCoopers Legal

Jan 2010 - Jun 2012 • 2 years 5 months

Lawyer

Lawyer

PwC

Jan 2010 - Jan 2012 • 2 years

Lawyer

Lawyer

Argyle Lawyers

Jan 2008 - Jan 2010 • 2 years

Paralegal & Solicitor

Paralegal & Solicitor

NSW Crown Solicitor's Office

Oct 2005 - Jan 2008 • 2 years 3 months

Education

LLM, Taxation Law

LLM, Taxation Law

University of Sydney

2008 - 2011

MLLP, Law

MLLP, Law

University of Technology Sydney

2003 - 2007

BMedSci, Medical Science

BMedSci, Medical Science

University of Technology Sydney

2000 - 2003

Contact information

Sydney, NSW

Suite 6.03, Level 6, 31 Market Street, Sydney, NSWWebsite

Practice certificate

Name
Jonathan O'Loughlin
Date of admission
2007
Certification type
Principal of a law practice
Class
Law Practice
Region
NSW

Last checked: 27 Aug 2026 • Checked with Law Society of NSW

Practice areas

Litigation & Disputes