Team up? Information

Thank you for considering working with us at One Session. To provide you with more insight into our company and the type of work we do, I will share some information about us and the qualifications we are seeking in a psychologist. If you believe your interest, skills and experience align well with our needs and mission, we would be excited to discuss the opportunity to work together further.

About me

As a psychologist and founder of One Session, I possess extensive experience in the field of mental health and personal development. Prior to starting One Session, I co-founded Kick Your Habits, an addiction care center. With One Session, I am dedicated to making mental health care more accessible and enjoyable. In 2020, my team and I introduced Single Session Therapy (SST) in the Netherlands. 

Additionally, I provide SST training courses, along with my colleague Ilonka Hanneman, for psychologists and I’m writing the first dutch book on SST.

About One Session

One Session is a psychological support service that provides anonymous and confidential one-hour video call sessions to employees through an online platform. Our Single Session Therapy approach focuses on the current issue and empowers the client to take the next steps, while offering quick availability when it matters. Our service is available evenings and weekends, with the option to book up to 48 hours in advance. We do not make follow-up appointments, but rather leave the direction with the client and offer advice for an appropriate course of action. 

Our method, SST, has been well researched and our service has a high satisfaction rate with an average client satisfaction rating of 4.8 out of 5. 

Demand for psychological support is increasing, and One Session offers a cost-effective and efficient solution for organizations looking to provide accessible and effective care to their employees.

Team up?

We are a dedicated team of professionals who specialize in the Single Session Therapy method, We are looking for an experienced psychologist to join our team and use their expertise to help clients feel better and function better in their lives.

As a member of our team, you will have the opportunity to work with a diverse group of clients and provide them with effective and efficient therapy in a single session.

The ideal candidate should have a strong understanding of psychology and be able to connect with clients in a real conversation. Working at One Session can be easily combined with other work, but a minimum availability of 8-10 hours is required.

Our organization provides Single Session Therapy (SST) outside of insured care, as it is currently only offered as one session at the point of need, without a diagnosis. We offer this service to companies as a way for their staff/employees to access it more easily. The benefit for clients is the quick availability without referral and intake, and for us, it reduces the need for administration and registration. We do not keep files or communicate with GPs or other organizations. The only administrative tasks we perform are keeping an agenda and completing an anonymous evaluation form after each session to reflect on the session and identify areas for improvement.


If you’re interested in joining our team as a therapist, you must meet the following requirements:

  • A master’s or doctoral degree in psychology
  • At least 5 years of experience as a therapist in various settings
  • Additional training and education in methods such as ACT, CBT, schema therapy, mindfulness, EMDR, EFT, positive psychology
  • Availability of at least 8-10 hours a week, including evenings and weekends
  • A passion for your profession and a willingness to think creatively about ways to improve and share information
  • Proficiency in English or other languages for coaching is a plus.

As a member of our team, you will have the autonomy to schedule your own sessions and manage your availability online. You will also have the opportunity to collaborate with other professionals and work towards perfecting the Single Session Therapy method. Our online platform allows you to connect with clients and offers the flexibility to organize your own schedule. You will also have the opportunity to work with experienced colleagues and engage in intervision, supervision, and continuing professional development. 

If you’re interested in joining our collective, please fill out the form via the provided link (NB the form is on our other website): 


The procedure for determining a potential collaboration with OneSession involves several steps. 

First, an initial video call is scheduled with me (Helen) to exchange information and assess if there is a good match. 

Next, an introduction to the SST method is provided to determine if it is a suitable fit for the candidate. Two trial sessions are then conducted with fellow psychologists, during which the candidate acts as both a therapist and a client, with the aim of gaining valuable insight into the method and experience from both perspectives. These sessions are conducted via Zoom, and are recorded for later review. After the sessions, the candidate fills out a short evaluation form and the recordings are reviewed. 

If all parties are still enthusiastic, a second video call with Ilonka Hanneman is scheduled to make a final decision on the collaboration. 

Any questions about the procedure can be directed to [email protected] with the subject “procedure” and a response will be provided within three workdays.


We are excited to expand our services to more countries in the EU and are seeking entrepreneurial psychologists who share our passion for Single Session Therapy. If you possess strong organizational, social, and sales skills, and are interested in helping us grow our business in your country, please reach out to me at [email protected] to discuss potential opportunities.

more information about SST