Patrick Groom Photo
Patrick Groom Photo
Patrick Groom Photo

Patrick Groom is designated as a Certified Specialist in Labour Law by the Law Society of Ontario. With more than 20 years’ experience in labour relations, he has developed particular expertise in construction labour relations and litigation, and health care restructuring.

Frequently appearing before all levels of court in Ontario, Patrick also represents clients at the Ontario Labour Relations Board, the Ontario Human Rights Tribunal, the Workplace Safety and Insurance Appeals Tribunal, the Nova Scotia Labour Relations Board, and the Newfoundland & Labrador Labour Relations Agency, as well as in private arbitrations across Canada.

Patrick advises on the development of proactive labour relations strategies that promote positive employee engagement, effectively respond to union organizing, institute best practices for occupational health and safety, and resolve of human rights issues in the workplace.

As an advisor with the Law Society of Ontario’s Coach and Advisor Network, Patrick enjoys mentoring and assisting fellow members of the bar.

Representative Matters

  • Bundge Hamilton Canada v United Food and Commercial Workers Canada, Local 175 (Representing Bunge Hamilton Canada in an arbitration in the matter of a policy grievance objecting to a mandatory vaccine policy)
  • Carpenters’ District Council of Ontario, United Brotherhood of Carpenters and Joiners of America v. Construction Demathieu & Bard (CDB) Inc., LIUNA, et al. – OLRB Case No: 1923-18-U, 1924-18-R and 2233-18-U
  • Johnson Controls Canada LP v Teamsters Local Union 419, 2022 (ON LRB)
  • Ontario Public Service Employees Union v Rouge Valley Health System, 2017 CanLII 35613 (ON LRB)
  • I.B.E.W. Construction Council of Ontario v Labour Ready, 2016 CanLII 49532 (ON LRB)
  • Canadian Union of Skilled Workers v Labourers’ International Union of North America, 2016 CanLII 46791 (ON LRB)
  • Carpenters’ District Council of Ontario, United Brotherhood of Carpenters and Joiners of America v. Brown Daniels Associates Inc., 2016 CanLII 46789 (ON LRB)
  • Ontario Public Service Employees Union v St. Elizabeth Health Care and Canadian Mental Health Association, 2016 CanLII 6536 (ON LRB)

Speaking Engagements

Navigating Vaccine Mandates Planning, presented to the Association of Consulting Engineering Companies members

March 1, 2022

Navigating Vaccine Mandates Planning, presented to the Association of Consulting Engineering Companies members

January 19, 2022

Navigating Vaccine Mandates Planning, presented to the Association of Consulting Engineering Companies members

October 5, 2021

Government Relations Update Ontario Electrical league, 2017 Electrical Industry Conference

May 5, 2018

Bill 148, Fair Workplaces, Better Jobs Act, 2017 Ontario Electrical League, 2018 Electrical Industry Conference

April 19, 2018

Bill 148, Fair Workplaces, Better Jobs Act, 2017 Ontario Electrical League, Durham Chapter

March 28, 2018

Bill 148, Fair Workplaces, Better Jobs Act, 2017 Ontario Electrical League, Ottawa Chapter

February 27, 2018

Legalization of Marijuana & Impact on Employers in the Construction Industry Landscape Ontario

February 9, 2018

Bill 132: Sexual Violence & Harassment Action Plan Act Ontario General Contractors Association

April 7, 2017

Reducing Turnover, Retaining Talent and Performance Management Landscape Ontario

February 21, 2017

Drugs and Alcohol in the Workplace Barrie Construction Association

June 21, 2016

The Employment Standards Act and Other Legislative Obligations Barrie Construction Association

June 8, 2016
Read more


Media Mentions

Rankings & Recognition

  • Brad Hodgson Civil Litigation Award, 2006
  • Labour & Employment Law Achievement Award, 2006

Directorships & Affiliations

  • Advisor, Coach and Advisor Network, Law Society of Ontario
  • Member, Thomas Moore Lawyers’ Guild
  • Member, Ontario Bar Association, Labour & Employment, Constitutional, Civil Liberties and Human Rights, and Construction Law

Education & Admissions

Called to the Ontario bar
Certified Specialist (Labour Law)
Doctor of Law (J.D.) LawUniversity of Western Ontario
Honours, B.A. - Law and Society, Political ScienceYork University


Insights (21 Posts)View More

Featured Insight

Part Two of McMillan’s R. vs Greater Sudbury Webinar

As a follow up to our first webinar back in December 2023 where we considered the history, details and legal implications of the Supreme Court of Canada’s decision in R. v. Greater Sudbury, please join us for “Part 2” where Patrick Groom, Victor Kim and Annik Forristal will be joined by a panel of industry experts.

Thursday, February 8, 2024
Featured Insight

R. vs Greater Sudbury Webinar

Following a brief overview of the case and the SCC’s split decision, this discussion will focus on the implications of the decision to the roles and responsibilities of each project party, including the owner, contractor and design consultant (architect and engineer). The discussion will be interactive and will include an extensive Q&A period.

Wednesday, December 13, 2023
Featured Insight

Automotive Webinar Series | Part III: Where Rubber Meets the Road: Automotive Litigation Update

At this session, our panel of experts will provide a panoramic view of the evolution of automotive class actions across Canada, a review of best practices for managing disputes with distributors and franchisees, and
insights into litigation and disclosure obligations arising from automotive industry labour issues.

Wednesday, November 29, 2023
Featured Insight

The 2022 Construction Labour “Open Period” – What Employers Need to Know

March 1 – April 30, 2022 is the “Open Period” for ICI collective agreements, and many non-ICI agreements, in Ontario. During this period members of construction unions can apply to the Ontario Labour Relations Board to terminate a union’s bargaining rights with their employer, or – more commonly – a rival union can apply to the Board to displace an existing union, in what is commonly known as a “raid”. During the Open Period employers will likely see increased union activity on sites as incumbent unions will seek to maintain member support, and as rival unions may try to gather support for a raid.

Join us on Wednesday, February 2nd for a discussion about what employers should expect and need to know if a decertification application or a displacement application involving their employees is filed at the Board.

Wednesday, February 2, 2022
Featured Insight

Mandatory COVID-19 Vaccination Policy Upheld

An Ontario arbitrator upheld an employer's vaccine mandate for both a site where a 3rd party obligation existed and a related site with no such obligation.

Read More
Jan 12, 2022
Featured Insight

Ontario Arbitrators Continue to Uphold Terminations of Employees who Breach COVID-19 Safety Protocols

A recent decision by an Ontario arbitrator further affirmed the notion that dishonesty during COVID screening protocols by an employee can lead to termination.

Read More
Jan 12, 2022
Featured Insight

A Rock and a Hard Place: Owner, Employer, and Constructor Liability Under the OHSA

Ontario Court of Appeal - construction project liability under OHSA despite retaining a constructor responsible for health & safety.

Read More
Dec 3, 2021
Featured Insight

Mandatory Vaccination Policy: “Reasonable, Enforceable”

A labour arbitrator upheld an employer’s mandatory vaccination policy, finding the policy to be reasonable and enforceable.

Read More
Nov 11, 2021
Featured Insight

Vaccination Mandates in the Construction Industry – What You Need to Know

An overview of vaccination mandates in the Construction industry and what you need to know.

Read More
Oct 12, 2021
Featured Insight

Sick, Lies, and Questionnaire: Arbitrators Uphold Terminations of Employees who Breached COVID-19 Safety Protocols

Two recent labour arbitration decisions held that attending work in breach of employer COVID protocols can lead to termination for cause.

Read More
Dec 9, 2020
Featured Insight

McMillan’s Employment and Labour Webinar

This annual workshop addresses significant legal developments and provides practical advice on responding to employee issues.

November 10, 2020 - 11:30 am to 1:30 pm
Featured Insight

Ontario Employers be Aware: New Mandatory Screening Requirements for Ontario Workplaces

Employers should take immediate steps to implement the new mandatory COVID-19 screening requirements for Ontario workplaces.

Read More
Sep 30, 2020
Featured Insight

Another Brick in the Wall (Removed) (Part 29): Court of Appeal Continues to Chip Away at ESA Termination Provisions

The Ontario Court of Appeal releases a ground breaking decision with respect to enforceability of termination provisions in employment agreements.

Read More
Jun 23, 2020
Featured Insight

Project Management Amid COVID-19 – The Triage

Best practices for construction project management during the COVID-19 pandemic, and other force majeure circumstances.

Read More
Apr 8, 2020
Featured Insight

The Impact of COVID-19 on the Construction Industry: A Reference Guide to the Changed Landscape

Contractual clauses, Permits & Inspections, Health & Safety, Labour, Litigation, Arbitration & Court Procedures,
Limitation Periods, Liens & Holdbacks

Read More
Apr 3, 2020
Featured Insight

The Impact of COVID-19 on the Construction Industry: McMillan Answers Your Questions

This webinar will unpack and address the impacts of COVID-19 on the construction industry and how these impacts can be best managed.

Mar 31, 2020
Featured Insight

Employment and Labour Seminar Series: Toronto

Join us as we discuss significant legal developments and provide practical advice on critical issues facing employers in Canada.

Oct 30, 2019
Featured Insight

Ontario Passes Amendments to the Labour Relations Act, 1995 and Employment Standards Act, 2000

Ontario Bill 66, the Restoring Ontario’s Competitiveness Act, 2018, received Royal Assent.

Read More
Apr 15, 2019
Featured Insight

Ontario Proceeding with Further Substantial Amendments to Workplace Legislation

Ontario has introduced Bill 66, the Restoring Ontario's Competitiveness Act, 2018, an omnibus bill that proposes changes to several statutes, the LRA and ESA.

Read More
Dec 14, 2018
Featured Insight

Helping Your Workplace Navigate the Legalization of Marijuana

McMillan has published a report entitled "McMillan (Chronic)le" to address questions to help your workplace navigate the decriminalization of cannabis.

Read More
Oct 3, 2018
Featured Insight

Puff, Puff, Pass-ed: What Employers Need to Know About Cannabis Legalization

Join us for an interactive webinar as we take a closer look at the potential impact of cannabis legalization, as well as the rights and responsibilities of employers in the Bill C-45 era.

Sep 12, 2018