Meet the Del Ferro Ambassadors

Successful in stuttering therapy since 1978

Femke Merel van Kooten

Ambassador

Jeff Tesselaar

Ambassador

Our ambassadors prove that a stutter-free life is a reality within everyone’s reach. They once stood exactly where you or your child stand today. They overcame stuttering through Del Ferro stuttering therapy and built immense self-confidence. Today, they share their personal success stories to inspire you and give you the courage to take that very same step.

Stemmen van hoop en ervaring

Today, these familiar faces speak with absolute fluency and confidence in the media and in public. From their own past, they know the daily frustrations of getting stuck on words. It is precisely this visible transformation that makes them the ultimate proof of our unique approach. Meet our proud ambassadors of the Del Ferro Institute below.

Femke Merel van Kooten

Ambassador

Since 2020, Femke Merel has been an ambassador for the Del Ferro Institute. As a former Member of Parliament, it is hard to imagine that she had a severe stuttering problem as a young girl. For years, she was not even able to pronounce her name, despite the many years of speech therapy she underwent. She achieved her dream of fluent speech at the age of thirteen when she overcame stuttering with the Del Ferro Method. Now she wants to bring this dream within reach for everyone who stutters.

I am wholeheartedly committed to Del Ferro, because you cannot truly be yourself if you stutter

Photo by Bjorn Paree

Jeff Tesselaar

Ambassador

Jeff Tesselaar has been an ambassador for the Del Ferro Institute since 2025. “I want to share my story so that others don’t have to go through the same thing. I was once told that I would never be able to overcome it—that I simply had to learn to live with stuttering. But that’s not true. You can overcome it. I am living proof of that.”

“What people see, someone getting stuck on words, is just the tip of the iceberg. Beneath the surface, there is so much tension, uncertainty, and sadness. That’s why I tell my story. Because who knows, maybe one day we can retire World Stuttering Awareness Day, because no one will need it anymore.”

I am an ambassador for Del Ferro because I know exactly how much stress and uncertainty lies behind a stuttering challenge.

Geïnspireerd door hun verhalen? Geef jouw stem ook door!

You don’t have to be a top athlete or a politician to make a massive impact. Anyone who reclaimed their voice thanks to Del Ferro, or witnessed it firsthand as a parent, can be a beacon of hope for someone else.

With our movement, Overcoming stuttering together, we are building a world where everyone speaks stutter-free and with full confidence. Become a speech buddy, share your transformation online, or become a specialist yourself. Your experience is worth its weight in gold.

Stuttering Therapy for All Ages

Put an end to stuttering and speech anxiety once and for all by training your primary breathing muscle: the diaphragm. The Del Ferro Method gives you back control to speak with complete fluency and confidence in any situation – from a casual conversation to a presentation in front of a packed room. Choose the training below that suits your age or goals, and learn to speak stutter-free.

Stuttering Therapy for Children

6 to 12 Years

Stuttering Therapy for Teens

13 to 17 Years

Stuttering Therapy for Adults

Ages 18 and Up

Why Are Thousands of People Able to Overcome Stuttering?

Most people who stutter receive the same advice: you have to learn to live with it. At Del Ferro, we have taken a very different approach for nearly 50 years.

What if the solution doesn’t start with accepting stuttering, but with addressing what physically happens during speech?

The Del Ferro Method offers a targeted solution for stuttering that remains overlooked in traditional speech therapy.

Enter your email address and discover in our free email series:

The Del Ferro Institute Is a Household Name in Amsterdam

While we spent decades helping thousands of people from our location on Apollolaan in Oud-Zuid, we have been doing so from our new institute in Buitenveldert since 2025.

Still located in the familiar Amsterdam-Zuid area, but now in a more spacious setting. Curious about the difference we can make in your life?

Discover Our Stuttering Therapy in Amsterdam >