Jonathan Wiesenthal — Principled Advocacy. Strategic Results.
Representing clients across corporate-commercial, construction, property, employment, administrative, estate litigation, personal injury, and insurance law with over a decade of litigation experience before Ontario courts and tribunals — bringing analytical clarity, disciplined judgment, and a commitment to cost-effective, principled advocacy to every matter.
Strategic Counsel for Complex Legal Matters
Multi-Area Litigation Practice
An experienced litigator advising on civil litigation, estate litigation, personal injury, business law, construction law, and employment law matters — representing individuals, businesses, insurers, municipalities, and not-for-profit organizations across Ontario with versatile courtroom skill and breadth of knowledge.
Licensed in Ontario Since 2015
Jonathan earned his Juris Doctor from the University of Windsor Faculty of Law and was called to the Bar of Ontario in 2015. He serves clients in Windsor, Essex County, and across Ontario with knowledgeable, results-driven legal representation built on more than a decade of diverse practice.
Courtroom & Tribunal Experience
Jonathan has appeared before the Ontario Superior Court of Justice, the Divisional Court, administrative tribunals, and in mediation proceedings — committed to resolving disputes efficiently through strong negotiation, effective courtroom advocacy, and practical legal guidance.
Expertise Across Multiple Pillars of Law
Business Law & Civil Litigation
Representing clients in complex business and civil litigation matters — from contractual disputes and shareholder litigation to commercial risk management and enforcement proceedings — with disciplined, principled advocacy before the Superior Court of Justice and Divisional Court.
Employment Law
Advising individuals, businesses, and not-for-profit organizations on employment law matters — including wrongful dismissal, constructive dismissal, workplace disputes, and employment standards — with practical, results-driven representation before Ontario courts and tribunals.
Construction Law
Advising and representing clients in construction law matters including non-payment disputes, delay claims, and adjudication proceedings at all levels.
Personal Injury & Insurance Litigation
Representing individuals and insurers in personal injury claims and insurance disputes — including motor vehicle accidents, slip and fall matters, occupiers' liability, and insurance coverage litigation — with focused advocacy before Ontario courts.
Estate Litigation & Fiduciary Disputes
Representing clients in estate litigation matters — including will challenges, dependant support claims, passing of accounts, and fiduciary disputes — with a strong understanding of the legal and emotional complexity these matters involve.
Practice Areas at a Glance
01
Employment & Workplace Law
02
Personal Injury & Insurance Litigation
03
Business Law & Civil Litigation
04
Construction & Real Property Litigation
05
Estate Litigation & Fiduciary Disputes
06
Administrative & Regulatory Law
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Member — Law Society of Ontario
A Client-Centred Approach to Complex Legal Matters
At Nanda & Associate Lawyers, Jonathan Wiesenthal approaches every file with the same disciplined focus — understanding that behind every legal dispute is a client whose interests, livelihood, and future are on the line.
Client Empowerment
Legal proceedings can be complex and stressful. Jonathan cuts through the complexity — keeping you informed, involved, and empowered to make the decisions that are right for you and your situation.
Litigation & Negotiation
Every matter is approached with the advantage of Jonathan's deep litigation background — appearing before the Ontario Superior Court of Justice, the Divisional Court, administrative tribunals, and in mediation proceedings to achieve efficient, cost-effective resolution for his clients.
Broad Practice. One Trusted Lawyer.
From employment disputes and personal injury claims to business law, estate litigation issues, and construction law, Jonathan brings focused expertise and a proven track record across multiple areas of law — delivering responsive, client-centred service at every stage.
Experienced Legal Representation Across Multiple Practice Areas
From employment disputes and personal injury claims to business law, estate litigation, and construction law, Jonathan Wiesenthal provides experienced, cost-conscious legal representation built on more than a decade of practice before Ontario courts and tribunals.
- Employment law & workplace disputes
- Personal injury & insurance litigation
- Business law & civil litigation
- Estate litigation & fiduciary disputes
- Construction & real property litigation
- Professional Affiliation: Member — Law Society of Ontario
- Fluent in English and French
- Serving clients in Essex County, Windsor, and across Ontario
Jonathan's broad expertise — spanning employment law, personal injury, business law, civil litigation, estate litigation, and construction law — means clients receive comprehensive, experienced legal support under one roof.
Areas of Focus & Legal Insight
Jonathan Wiesenthal brings focused legal knowledge across employment law, personal injury, business law, civil litigation, construction law, and estate litigation — ensuring clients benefit from a lawyer who understands the full legal landscape of their situation, from initial consultation through to trial.
Business Law & Civil Litigation
Representing clients in complex business and civil litigation matters — including contractual disputes, shareholder litigation, commercial risk management, summary judgment motions, injunctions, and enforcement proceedings — with skilled, principled advocacy before Ontario courts.
Construction Law
Advising and representing clients in construction law matters — including non-payment disputes, delay claims, and adjudication proceedings at all levels — with thorough knowledge of applicable statutes and a focus on efficient, early resolution.
Employment Law & Administrative and Regulatory Law
Advising individuals, businesses, and not-for-profit organizations on employment law matters — including wrongful dismissal, constructive dismissal, and workplace disputes — and representing clients before administrative tribunals, on judicial review applications, and in appeals before Ontario courts.
Personal Injury & Estate Litigation
Representing individuals and insurers in personal injury claims and insurance disputes — including motor vehicle accidents, slip and fall matters, and occupiers' liability — as well as advising on wills and estate matters, representing clients in estate litigation and fiduciary disputes.
Committed to Your Case. Focused on Results.
Whether you are facing an employment dispute, a personal injury claim, a business or civil litigation matter, a construction law dispute, or an estate litigation issue — Jonathan Wiesenthal brings the experience, analytical depth, and client-focused approach your situation demands. When the stakes are high, choosing the right advocate matters most.
Understand Your Options
Your first step is understanding where you stand. Jonathan provides a frank, thorough assessment of your matter — outlining every available path and the strategy most likely to protect your interests.
Work with a Trusted Advocate
Backed by over a decade of experience in corporate-commercial and multi-area litigation, Jonathan is your trusted advocate at every stage of your legal matter — disciplined, analytical, and committed to results.
Take the First Step
Contact Nanda & Associate Lawyers today to speak with Jonathan Wiesenthal and discover how he can help you achieve a principled, cost-effective outcome for your case.
FAQ's
What counts as wrongful dismissal in Ontario?
Wrongful dismissal generally occurs when an employee is terminated without adequate notice or severance pay as required by their employment contract or Ontario employment standards, not necessarily termination without “just cause.”
Can an employment lawyer help me negotiate a severance package?
Yes — an employment lawyer can review your severance offer, advise whether it’s fair given your role, tenure, and age, and negotiate on your behalf for a better outcome. Jonathan R. Wiesenthal at Nanda & Associate Lawyers practices employment law alongside personal injury, business, civil litigation, and wills & estate matters.
How much does an employment lawyer cost in Ontario?
Fees vary by lawyer and case complexity; some employment lawyers offer a free initial consultation, and severance negotiation matters may sometimes be handled on a partial contingency basis.
How long does a wrongful dismissal claim take to resolve?
Many wrongful dismissal matters settle within a few months through negotiation. If a claim proceeds to litigation, it can take a year or more.
Meet Our Family Law Lawyers
Marlene Shiner and Linda Starova practise exclusively in family law at Nanda & Associate Lawyers — serving families across Mississauga, Toronto, and the GTA.