James O'Sullivan
About James O'Sullivan
James O'Sullivan is a lawyer based in Calgary, AB and has been recognized in The Best Lawyers in Canada™ since 2020. James O'Sullivan is recognized in the following practice areas:
- Calgary, Alberta
- Cannabis Law
- Mergers and Acquisitions Law
- Securities Law
Current Firm: Dentons Canada LLP
Location: Calgary, AB
It takes just a few minutes to optimize your profile for clients looking to engage and lawyers who are ready to refer.
Activate your profile and highlight why your peers recognized in Best Lawyers today.
Nearby Lawyers
Sherrilynn J. Kelly is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Sherrilynn J., who practices law in Calgary, Alberta, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Sherrilynn J. is held by other top lawyers in the same geographic and legal practice area.
Christiana joined Parlee McLaws’ Calgary office as an Associate in 2014 upon the completion of her Articles with the firm, having been previously admitted to the practice of law in New York State in 2010. She is an experienced trial and appellate litigator with a practice focused on civil litigation and administrative law, specifically in the areas of energy, construction, aviation, municipal governments, and insurance. Christiana has represented clients before the Alberta Court of Just...
Jennifer Kennedy's practice focuses on corporate and securities law matters, with a focus on public and private financings, including cross-border financings, mergers & acquisitions, corporate restructurings and related-party transactions. Ms. Kennedy has acted for issuers, selling shareholders, independent committees of boards of directors, investment dealers and private equity investors in a variety of debt and equity capital market transactions, including project financings. Ms. Kenned...
Lewis’ practice focuses on regulatory and administrative law matters involving both the electricity and oil and gas sectors including all aspects of rate applications, toll design, facilities applications, cost of capital and related matters before the Alberta Utilities Commission, the Alberta Energy Regulator (and the Canada Energy Regulator, the BCUC, OEB, Manitoba PUB, and the Canada Newfoundland and Labrador Offshore Helicopter Safety Inquiry. He has appeared at all levels of the Al...
Micah graduated with Distinction from the University of Saskatchewan College of Law in 2011. He has been practicing exclusively in the area of family law for over a decade. Earlier in Micah’s legal career, his family law practice focused on high-conflict cases involving child custody, family violence, and urgent financial matters. He joined the partnership at Soby Boyden Lenz LLP in 2021 and has had an active mediation practice since 2022. Micah’s experience with high conflict fam...
Laura Comfort is a top attorney recognized by Best Lawyers in the practice area(s) of Personal Injury Litigation. Laura, who practices law in Calgary, Alberta, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Laura is held by other top lawyers in the same geographic and legal practice area.
Jennifer McPherson is a corporate and commercial lawyer focusing on corporate finance and securities, mergers and acquisitions, and general corporate and commercial matters. Jennifer has acted for private and public companies on a broad range of matters, including public offerings, private placements, plans of arrangement, and asset and share purchase and sale transactions. She has also advised clients on stock exchange listings, continuous disclosure matters, and corporate governance issues.
Katherine Prusinkiewicz is the knowledge lawyer for the Calgary office, working to leverage the practice's collective wisdom to ensure efficiency and uniform quality. She supports lawyers in our business law group with model documents and precedents, legal updates, training and other information needs and assists in our client communication program. As a result of our knowledge management initiatives and the practice’s culture of contributing and sharing knowledge, our clients can expec...
Emi R. Bossio is a top attorney recognized by Best Lawyers in the practice area(s) of Alternative Dispute Resolution, Appellate Practice, Corporate and Commercial Litigation, Labour and Employment Law and Product Liability Law. Emi R., who practices law in Calgary, Alberta, has been recognized since 2014. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Emi R. is held by other top lawyers in the same geographic and legal practice area.
Jill Wilkie is a trusted advisor to employers and specializes in advising on all aspects of labour and employment law, and is the Leader of Miller Thomson’s Labour & Employment Group. She has developed significant expertise in assisting clients in the health, manufacturing and education industries, as well as in Alberta’s Indigenous communities. Jill’s experience includes advising on the discipline and dismissal process, the defence of wrongful, constructive and unjust d...
Explore and Learn
Recognizing Legal Leaders: The 2027 Best Lawyers Awards in Australia, Japan and Singapore
by Jamilla Tabbara
Market drivers, diversity trends and the elite practitioners shaping the legal landscape.
Musk v. Altman: The Lawyers Behind the Case
by Jamilla Tabbara
Meet the Trial Lawyers Shaping One of AI's Biggest Legal Disputes.
The Best Lawyers in France 2027: Peer-Reviewed Excellence
by Jamilla Tabbara
Seventeen editions of peer trust, a growing profession and a dynamic legal market.
Announcing the 2027 Best Lawyers Awards: Austria, Germany and Switzerland
by Jamilla Tabbara
Celebrating the legal professionals throughout Central Europe.
The Legal Teams Behind the Blake Lively–Justin Baldoni Settlement
by Grace Greer
A closer look at the legal teams and attorneys involved in the Blake Lively–Justin Baldoni litigation and its resolution.
Can You Go to Jail at an Arraignment?
by Bryan Driscoll
Understanding What Happens at Your First Court Appearance.
When Is It Too Late to Stop Foreclosure?
by Bryan Driscoll
Understanding the foreclosure timeline, critical deadlines and the legal options that may still protect your home.
How AI Is Changing the Way Clients Find Lawyers
by Jamilla Tabbara
Best Lawyers CEO Phil Greer explains how AI-driven search tools are reshaping legal marketing and why credibility markers matter.
When to Get a Lawyer for Work Injury
by Bryan Driscoll
Understanding your rights and navigating the complexity of workers’ compensation claims.