Denny Portier Terpstra


Denny Portier-Terpstra

The Netherlands

  •      Coach

  •      Mentor

  • IRCM Registered

  • External Verification

  • Qualified

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 Coaching and Mentoring industry's minimum levels of Core Competencies.

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20 - 25 years of working in the coaching and mentoring industry

  • Management Coaching
  • Human Resources Coaching
  • Human Resources Mentoring
  • Professional Development Mentoring
  • Organisational culture and behavioural Coaching
  • Organisational culture and behavioural Mentoring

This individual is REGISTERED with the IRCM.

Professional Body Accreditation/Credential Date ¹

¹ format = DD/MM/YYYY

click here to confirm the status of the Professional Body - Recognised, Registered, or Accredited.

Name: Type of
Date ¹

This Coach and/or Mentor may have 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 and/or Mentor.

¹ format = DD/MM/YYYY

click here to confirm the status of the:

  • Formal Education Body - Registered, or not?
  • Commercial Training Organisation - Registered, Accredited by a Professional Body, or not?

On A Mission

Registered at the Chamber of Commerce

The Netherlands

The Netherlands



Currently, all information provided by and correspondence with
the IRCM is in English.