

Matthew Mennilli is a distinguished Partner at Morris Mennilli, where he brings comprehensive expertise in commercial and administrative law disputes. His practice spans various industries, including financial services, energy and resources, construction, and agriculture. Matthew is adept at navigating complex disputes for ASX-listed corporations, private companies, and individuals. His notable cases encompass claims from environmental disasters, securities and financial services class actions, and alleged contraventions of the Corporations Act. Matthew's legal acumen extends to handling shareholder disputes, judicial reviews, and public inquiries, including those conducted by ICAC. He is also experienced in ASIC investigations and prosecutions. His focus areas include class actions, corporate disputes, and regulatory inquiries. Matthew has played a pivotal role in cases such as the environmental destruction of the Jaba-Kawerong river system and a class action against a major financial services provider for alleged breach of fiduciary duties. His career includes significant tenures at Piper Alderman, where he was a Senior Associate and an Associate, and at McCabes Lawyers as a Solicitor. Matthew's legal journey began at Ritchie & Castellan, Solicitors & Notaries. His academic background features a Bachelor of Laws (Hons) and a Bachelor of Arts from Macquarie University, further supplemented by a Graduate Diploma of Legal Practice from The College of Law Australia. Based in Sydney, Matthew is committed to delivering exceptional legal representation and strategic advice to his clients.
Law Clerk
Ritchie & Castellan, Solicitors & Notaries

Partner
Morris Mennilli
Jul 2022 - Present • 4 years 3 months

Senior Associate
Piper Alderman
Jul 2018 - Jun 2022 • 3 years 11 months

Associate
Piper Alderman
Jul 2015 - Jun 2018 • 2 years 11 months

Lawyer
Piper Alderman
Aug 2014 - Jun 2015 • 10 months

Solicitor
McCabes Lawyers
Dec 2012 - Jul 2014 • 1 year 7 months

Graduate
McCabes Lawyers
Feb 2012 - Nov 2012 • 9 months

Graduate Diploma of Legal Practice
The College of Law Australia
2012

Bachelor of Laws (LLB) (Hons) / Bachelor of Arts
Macquarie University
2007 - 2011
Best Lawyers in Australia – ‘Ones to Watch’ in Alternative Dispute Resolution
Best Lawyers in Australia
Best Lawyers: Ones to Watch in Australia Awards 2025 - Alternative Dispute Resolution
Best Lawyers: Ones to Watch in Australia
Best Lawyers in Australia – ‘Ones to Watch’ in Alternative Dispute Resolution
Best Lawyers in Australia
Last checked: 23 Jul 2026 • Checked with Law Society of NSW