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Handling Toxic Personalities in the Workplace

In any organization, there are inevitably those people whose aggressive, rigid or impulsive attitudes and behaviours poison the work environment and compromise team performance. Some are unaware of the impact of their actions on their co-workers, while others are deliberate saboteurs. The purpose of this seminar is to help you better understand the dynamics of toxic behaviour so you can handle it effectively and protect yourself from the fallout. Armed with this knowledge, you will be in a position to develop various strategies to encourage difficult employees to cooperate and meet performance expectations.


$1,695 + taxes


Two days – 9 a.m. to 5 p.m.

Course given in French

Offered at HEC Montréal
November 8, 9, 2023
March 20, 21, 2024

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  • Understand the root causes and dynamics of toxic behaviour in the workplace.
  • Recognize the signs of personality disorder.
  • Determine how to react to employees with work-related behavioural problems.
  • Help employees in these situations perform effectively on the job.

Is this for you?

  • Professionals, managers, mid-level and senior executives

Special features

  • Opportunity to build a comprehensive “detox toolbox”

"Excellent seminar. The concepts taught will help me take swift action whenever problems arise by identifying the symptoms, causes and repercussions. I’ll be able to use these tools to take a step back from the situation and come up with potential solutions."

Alain Côté, Director, Operations, Industry Canada

"Excellent seminar, with great tools for managing sensitive human resources situations. Everybody with supervisory responsibilities should take this course."

Isabelle Goulet, Manager, Investigations, Environment Canada


Estelle M. Morin
Estelle M. Morin
MPs, PhD (Psychology), ESCI and MSCEIT accreditation
Professor, HEC Montréal

Difficult personalities and toxic behaviours

  • Basic notions of personality and mental health
  • Root causes of toxic behaviour and negative conduct in the workplace
  • Main types of psychological disorders encountered in a work environment
  • Determining the severity of a problem

Case study: Healers, heal thyselves…

Self-esteem and morality

  • Understand narcissistic, paranoid and antisocial personality disorders
  • Find out how to deal with these types of individuals
  • Find out how to manage these types of employees from a human resources point of view

Authority and control

  • Understand obsessive-compulsive, borderline and passive-aggressive personality disorders
  • Find out how to deal with these types of individuals
  • Find out how to manage these types of employees from a human resources point of view

How to adjust, protect yourself and develop healthy workplace relationships

  • Protecting yourself: Knowing how to back off
  • Managing your own feelings
  • Detox toolbox
  • Experience-based content
  • Case studies
  • Sharing of participants’ experiences
  • Team exercises
  • Reflection on key concepts
  • Integration of scientific principles

Participants in all of our seminars will receive a certificate of completion from Executive Education HEC Montréal.

For more information about this program

 Make an appointment with:

Émilie Mazet

Émilie Mazet
Program Manager

 By Email
 By Phone

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Executive Education > Our programs > Seminars > Handling Toxic Personalities in the Workplace