Project Description

Denny Portier-Terpstra


On a Mission, a better place
The Netherlands




IRCM Register Status


IRCM Accreditation



Trading Status

Currently trading     



Denny Portier-Terpstra, based in The Netherlands, is a specialist in strategic human resource management and leadership with over 20 years of experience.

Having established her own company On A Mission, Denny is currently working as an independent and professional sparring partner for (HR) professionals, managers and leaders –  individually and in teams – who wish to develop their (strategic) human resource management and/or (strategic) leadership competencies.

Before she ventured out on her own, Denny worked in various HR roles. Most recently she worked 9 years in a (director level) strategic HR Business Partner role at UBM Plc. In the 10 years before that, she worked as an HR Assistant, HR Consultant and HR Manager, working her way up through the ranks in HR.

On the side, Denny has also founded and established RadioCorp BV, a very successful media company in The Netherlands. She has held both chief executive and non-exec board roles, and was a shareholder of this company until the company was sold to Talpa in 2016.

Throughout her career, Denny has gained years of experience with developing internal mentoring and coaching programs, buying coaching and mentoring services, and receiving training and acting as a mentor and a coach herself.



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I agree to abide by the IRCM’s Disciplinary Procedures.

I recognise the IRCM as the coaching and mentoring industry Ombusman.







Management Coaching

Human Resources Coaching

Human Resources Mentoring

Professional Development Mentoring

Organisational culture and behavioural Coaching

Organisational culture and behavioural Mentoring




Maartensdijk, The Netherlands

Trading Start Date: 2018

Legal Entity Structure: Registered at the Chamber of Commerce
Chamber of Commerce registration number: 70692661


Coaching and/or Mentoring Accreditation/Credential and Training:

Accreditation/Credential: Award Date
Training: Course Date qualified

This coach/mentor has undertaken additional formal and informal Qualifications, Training, as well as a range of Short Courses and Workshops.
For more information about their qualifications and training, please contact the coach/mentor.


This organisation provided the details on registration and with the exception of the Listed, Registered, Accredited flags; the extent to which you may rely on the information displayed and to be correct is in the hands of the Organisation.


are professionals and organisations who have been listed either during the IRCM’s independent search of the globe to discover exactly how many coaches, mentors, and organisations are currently trading; or by request.  These professionals and organisations may have selected not to confirm their details, register or accredit with the IRCM and have not confirmed that they abide by the unified Code of Ethics and disciplinary procedures.

are professionals and organisations who have agreed to abide by a unified code of ethics and disciplinary procedures.

are professionals and organisations who have agreed to abide by a unified code of ethics and disciplinary procedures; and who have successfully completed the IRCM’s accreditation process.


demonstrates that the coach or mentor has valid Professional Indemnity Insurance.  It is recognised that not every country recognises Professional Indemnity Insurance, but it is the recommendation of the IRCM that all coaches and mentors have valid Professional Indemnity Insurance.