All articles.

Everything about selling honestly and relaxed, from the model to daily practice.

Read the whole series in order
The second print run is in. 2,500 books
Book25 January 2026

The second print run is in. 2,500 books

This still feels unreal. The second print run is in. Grateful to everyone who reads this book and passes it on.

From persuading to honestly helping: how to transform your sales team
Training23 January 2026

From persuading to honestly helping: how to transform your sales team

Your sales team calls customers and sends proposals, but somehow it feels forced. The targets are met, but the atmosphere is tense.

Number 1 in the Managementboek Top 100
Book20 January 2026

Number 1 in the Managementboek Top 100

Why does selling feel so forced? Because we are taught to persuade instead of help. This book shows how sales works when you listen honestly.

The Sales Excellence Training with Heigo
Training20 January 2026

The Sales Excellence Training with Heigo

What energy! At the closing session of the Sales Excellence Training with Heigo. In one month we worked through the full programme together.

The book is a Bestseller at Managementboek
Book7 January 2026

The book is a Bestseller at Managementboek

Number 1 in the Marketing category. And number 1 in the Advertising and Sales category.

BAM! Number 1 at Managementboek in the Marketing category
Book2 January 2026

BAM! Number 1 at Managementboek in the Marketing category

How wonderful that I can help so many people with honest and relaxed sales. A great reason to pop open a bottle of champagne.

Book11 December 2025

The aftermovie of the book launch

With wonderful speeches by Pim van Tol (editor) and Simon Kornblum (managing director of Visma).

My new book: Sales, Honest & Relaxed
Book2 December 2025

My new book: Sales, Honest & Relaxed

YESS! This milestone has been reached. I am so grateful for all the wonderful people we celebrated this with.

At the end of November I am launching my book: Sales, Honest & Relaxed
Book11 November 2025

At the end of November I am launching my book: Sales, Honest & Relaxed

More than 25 years of sales experience with clients like Google, Samsung, Microsoft and ING. Everything I have learned, brought together in one book.

From customer to colleague: Joost Wammes becomes Customer Success Manager
News4 October 2025

From customer to colleague: Joost Wammes becomes Customer Success Manager

I spoke to four trainers. Three of them were mostly focused on their own offering. But with Klaas it was different.

Sales Excellence Autumn Training: 10% better at sales in one month
Training16 September 2025

Sales Excellence Autumn Training: 10% better at sales in one month

Are you an entrepreneur or responsible for sales? Then these are the months when it happens.

21.7% better at sales after one month, that is exactly what happened to Joost
Training9 August 2025

21.7% better at sales after one month, that is exactly what happened to Joost

"I want to become the best at sales," said Joost. He already had experience, but felt there was more in him.