This network is phenomenally useful for cities like New York. I do want to strenuously argue for cities to join the Sharing Cities Alliance.

Alicia Glen - former Deputy Mayor of New York City (US)

I’m extremely proud that you launched the Sharing Cities Alliance in New York. I see it as a crown on your work. I hope we will see much more of your expertise in the coming years.

Kajsa Ollongren - former Deputy Mayor of the City of Amsterdam (the Netherlands)

Being part of the Sharing Cities Alliance offers the opportunity to discuss our ideas, share our successes, failures and challenges. It enables us to collectively figure out how we can make our cities what they need to be. 

Ernest Chrappah - City of Washington, DC (US)

You have a wide variety of very relevant expertise.

Singapore government

Extremely interesting, relevant and insightful. 

City of Cape Town (South Africa)

Really appreciate our talks and your great thoughts and ideas. 

City of Malmö (Sweden)

Thank you for your advice, direction and contribution.

World Economic Forum (Switzerland)

Your contributions were highly valuable.

European Commission (Belgium)

Thanks for today! It was such an interesting session and I wanted to reach out to talk more! I would love to connect to pick your brain, perhaps together with the full team.

H&M Group (Sweden)

I thoroughly enjoyed working with Harmen and the Sharing Cities Alliance during my time at the City of Rotterdam. Harmen not only brings an extensive network and knowledge to the table but also professionalism combined with a good dose of humor and creativity. It was a pleasure to work with someone with his skill set and I look forward to collaborating in the future.

City of Rotterdam (the Netherlands)

Thank you for your presentation today! I loved it! You have a great energy!

H&M Group (Sweden)

You’re really important to us because of your enormous network.

City of Amsterdam (the Netherlands)

Your organization is very knowledgeable and well connected.

Embassy of the Netherlands (Israel)

Really inspired by your work.

MIT (US)

Thank you for your inspiring ideas at our global Government & Public Sector Industry Insights session about the Metaverse. It was very interesting to hear your assessment on key success factors for metaverse use cases in the public sector.  

PwC (Germany)

Several important new insights. I highly recommend them.

Shareable  (US)

Near-impossible amount of talks, connections-building and advice.

Nyenrode Business University (the Netherlands)

Nothing beats a global perspective.

City of Washington, DC (US)

The Sharing Cities Alliance network is full of energy and people willing to think together about what future is desirable. It is important that organizations, companies, and people with different perspectives meet each other and discuss topics related to technology and public values.

City of Amsterdam (the Netherlands)

Thanks for all the important work you do.

Trinity College (Ireland)

You have built a great portfolio and continue to do so.

Ministry of Economic Affairs (the Netherlands)

Grateful to be surrounded by inspiring people like you. 

April Rinne (US)

We learned a lot from your vision, philosophy and enthusiasm.

Mitsui (Japan)

Fantastic inspiration and really good discussions. We get so much inspiration from you and your network.

IKEA (Sweden)

Interesting insights. You have an outstanding know-how.

Mercedes-Benz (Germany)

The scale of your work is impressive.

Xynteo (United Kingdom)

You have a really strong international network.

Randstad (the Netherlands)

Amazed by the initiatives carried and executed by your organization.

Dubai Government (UAE)

We are super impressed.

Recycle Build (Brasil)

What you are doing is unique.

Sidewalks Labs (US)

Thank you so much for taking the time. It was really valuable and sparked new ideas! I definitely think we should talk more.

Ingka (Sweden)

Thank you very much. It was very interesting and filling with hope and excitement.

Yaeli Etstein (Israel)

Thank you for being an expert and mentor in our ‘From Linear to Circular’ programme. The participants very much enjoyed the sessions; they found it inspiring and very useful.This opportunity makes the learning programme even more enriching and we could not have done it without you.

Ellen MacArthur Foundation (United Kingdom)

Thank you very much for your great effort and fantastically done job especially knowing the time frames of your involvement and the level of mobilization you had to reach. It was a real pleasure to work with you.

— City of Moscow

A special shout-out to you. I was watching the session all the way and truly enjoyed it and I very much appreciate your attitude and professionalism. It also was very human which I really appreciate. That was truly enjoyable! Thank you soo much for creating a great atmosphere. It was an enjoyable experience, I'm grateful for your significant contribution and kind attitude.

— Smart Cities Moscow Forum

It was wonderful to have you as guest lecturer. The feedback from students was really nice and they enjoyed your talk. Would be great to continue our collaboration and expand to wider horizons.

Malmö University, Department of Urban Studies - Unit of Built Environment (Sweden)

Thank you for a really inspiring lecture! I think it was fantastic. It’s all incredible relevant. You touched on a lot of stuff we started talking about with our students and I think we will keep coming back to what we’ve heard from you today during the course.

Malmö University, Department of Urban Studies - Unit of Built Environment (Sweden)

Super interesting as always, the Sharing Cities Alliance magazine. Thank you for your commitment to spreading content and hopes to imagine an increasingly sustainable and human-friendly city. We really need it :)

Marta Mainieri (Italy)

Nothing beats a global perspective! Thanks for the rich content (of the Sharing Cities Magazine)

Ernest Chrappah (Washington, DC)

I love how your brains work!

Appjobs (Sweden)

The cities you represent are among the most dynamic in the world.

International Organisation of Industrial and Service Cooperatives (Belgium)

You gave a lovely talk about examples of sharing from your own life. You talked very much about the mundane side of living, sharing and being part of cities. This is so fundamentally important when we talk about cities. I’ve been at many conferences and events where people talk about cities and sometimes I wonder the last time that person actually was in a city, the last time they walked on the streets and in the back lanes and were part of the life in cities. Cities are buzzing, vibrant places, or we hope them to be. And for me, when you were talking, you made me think about the life of the city, and about two particular visions we have about the city: one of them is the smart city, the technological, the intelligent city, sharp and smooth and everything works. I’ve never seen one of those types of cities, but a lot of people have a visions of that city. The other city is the version that I think Harmen talked about: the vibrant, buzzing, full of people where sharing is merging into people’s lives and so on. And I don’t think that these visions are incompatible. I do think they can fit together, but I do think there are serious tensions between these visions and what we want going forward. I think we have to confront those tensions if we want to be living in prosperous, sustainable and lively cities.

Sharing Cities Sweden

You have an impressive track record.

NewCities (Canada)

Conversation with you is always enlightening and wonderful. I really respect your expertise and openness.

The Class Foundation

Great to have you with us these days. Thanks for your contribution! Good to stay connected.

IKEA (Sweden)

It was great having you for our forum on resilient cities. I am inspired by your insights. People responded warmly to the your stories on sharing. We will evaluate data to check our online attendance, I believe it will be a record high. Thank you very much!

Urban Land Institute (China)

I am thankful for the opportunity to have connected and learnt from you during your talk at the sharing cities workshop our ministry held, and I would like to wish the Sharing Cities Alliance the very best as you continue your good work amidst this changing and challenging global climate. I hope our paths will cross again!

Ministry of Culture, Community and Youth (Singapore)

I want you to know that we are truly very excited about this webinar series. The series has been quite popular and you’ve been able to secure some pretty phenomenal guest speakers.

Urban Land Institute (US)

We would like to thank you for your active engagement in promoting the concept of sharing cities during the last years.

City of Göteborg (Sweden)

We found the webinar extremely interesting, relevant and insightful hearing on the various perspectives that tourism will / may play in the current and post pandemic era. We will definitely be interested in joining additional webinars moving forward.

City of Cape Town (South Africa)

The relation to you has been very, very fruitful.

City of Malmö (Sweden)

You inspire me, and our meeting was literally the fuel I needed.

Recycle Build (Brasil)

Your full-time commitment to the sharing economy and its values is something that truly intrigues me.

AM Legal (the Netherlands)

You were great. If we at one point need a keynote speaker for this topic again we know who to ask!

Berlin Partner für Wirtschaft und Technologie (Germany)

You are one of the founding fathers of Amsterdam Sharing City. I have worked closely with you over the past years. You know everything that is going on worldwide regarding sharing or platform economy and you have a great network. But most important: you are a fun guy and always happy to help.

City of Amsterdam (the Netherlands)

I'm deeply grateful for what was such a great gathering on many levels. Looking forward to creating more impact together, thank you!

Shareable (US)

The Sharing Cities Summit was fantastic! I felt energized and inspired to be among so many passionate people taking on some of the world’s biggest challenges. The networking was really good. I hope slides from the summit are shared quickly. This morning I am briefing my senior management team on how we can even be more aggressive with our priorities given the overarching backdrop of sustainable development.

DC Government (US)

Many thanks for being part of the Summit and the opening plenary! We have received very positive feedback from participants.

Sharing Cities Sweden

Thank you for the great summit! I sure learned plenty and met with amazing people.

Innoloft (Germany)

Really liked your presentation. It’s obvious that you feel home on stage.

InnoEnergy (France)

You can really convince people.

KTH - Royal Institute of Technology (Sweden)

Your know-how might help us to better serve city’s requirements and to provide mobility services, which capture the benefits of the shift – from cleaner air to less congestion.

Mercedes-Benz (Germany)

You're the spider in the web of the sharing economy.

International Institute for Industrial Environmental Economics - Lund University (Sweden)

Boston has a lot of characteristics we could actually work with an organization such as yours and really, really benefit.

Northeastern University (US)

I had two very good, useful and beautiful days in New York during the Sharing Cities Summit. I would like to thank you for your contribution to this. It is wonderful to see that our first Sharing Cities round table has become a useful, necessary and entertaining event. For us as cities, it is crucial that we share our knowledge and experiences with each other. It is clear to me that your vast network and knowledge on the topic of the sharing economy has played an important role in getting the event to this level. I have enjoyed and learned from your performances at the Summit and I am extremely proud that you have launched the Sharing Cities Alliance there, in New York. I see it as a crown on your work, but certainly not the end of it! I hope we will see a lot of your expertise in the coming years.

Kajsa Ollongren (former Deputy Mayor City of Amsterdam)