- Subject
- About us
- For
- anyone who wants to know who they are dealing with
- Status
- final
A consultancy that leaves a report behind. A consultancy that stays until it works.
Helder Advies is a small firm with four permanent consultants and a network of twelve specialists. We work alongside your people, and we are only satisfied when it keeps working after we have gone.

Why Helder Advies exists
In 2005 Machteld Ravenhorst, then an HR director, was in her third reorganisation in six years. A big firm came in, a thick report came out, and once the firm had left, everything went back to how it was.
A year later she started Helder Advies, with one promise: no report that disappears into a drawer. We work alongside your people, we agree an end date, and after six months we ring the bell to see what stuck.
The people
Machteld Ravenhorst
Founder · change management
Spent twelve years as HR director in elderly care and went through three reorganisations there as the one who had to carry them out. Started Helder Advies in 2006 with one promise: no report that disappears into a drawer.
Call Machteld about mergers, reorganisations and the works council
Diederik Wolthuis
Partner · interim management
Was interim director at two housing associations, a vocational college and a home care organisation. Calm in a crisis, strict on agreements. The end date is in his diary from day one.
Call Diederik about temporary leadership and getting finances in order
Jorinde Keuning
Consultant · culture and collaboration
Organisational psychologist. Would rather sit in a team meeting on the shop floor than in a steering group. Brings out what everyone feels but nobody says.
Call Jorinde about teams that work past each other
Wander Tjalsma
Consultant · leadership
Was operations director of an installation company with 120 engineers. Coaches managers who are strong in their field and now have to lead a team.
Call Wander about new managers and management teams
The network
Twelve independent specialists we have worked with for years. We bring them in when a project calls for it, and only then.
- 3interim managers and executives
- 2organisational psychologists
- 2HR specialists
- 2trainers for teams and managers
- 1financial specialist
- 1employment lawyer
- 1communications adviser
What we would rather not do
| What you may be used to | How Helder does it |
|---|---|
| A report that disappears into a drawer | A plan on one A4 page that your own people carry out |
| A standard model for every organisation | An approach that starts with your question |
| Projects without an end | An end date from the first week |
| Juniors on the job, partners in the photo | Experienced consultants, right up to the last month |
Commitments on quality
- Certified
- Our permanent consultants are Certified Management Consultants (CMC).
- Code of conduct
- We follow the professional code for organisational consultants.
- Confidential
- Everything we hear in conversations stays within the project.
- Complaints procedure
- Not satisfied? An independent colleague takes a look.
- 19
- years of change projects
- 140+
- clients
- 6
- months after the end, a return day
Appendix A · Invitation
A first conversation costs you an hour. Nothing else.
We come to you, or you come to our office on Voorbeeldstraat. You outline the situation. After an hour you know whether we can help, and what that would look like.