Our mission is to provide innovative solutions to the world's infrastructure challenges with passion and analytical rigor.


Castalia was founded in 1980 by Roland Leroy, and built around innovative thinking on the organisation of public services. Castalia pioneered public private partnerships in infrastructure around the world. The firm drew on French models such as lease and concession contracts, and adapted them to work in diverse circumstances in Europe, Asia, Africa, Latin America, and the Caribbean.

Since 1980, the company has grown in staff numbers, international coverage, and areas of work. Led by Chief Executive, David Ehrhardt, and Executive Director, Alex Sundakov, Castalia now has over 40 professional staff and has offices in Washington DC, USA; New York, USA; Paris, France; Sydney, Australia; Wellington, New Zealand; and Bogota, Colombia.


The approach to every assignment is unique. But we have some simple rules which we have found contribute to success:

  1. Agree and document the objectives of the assignment at the start
  2. Develop a range of options, in consultation with the client
  3. Help the client to assess options and the objectives, and make a decision
  4. Agree an implementation plan
  5. Ensure accountability for implementation, that the necessary resources are provided, and that there is a structure for dealing with implementation issues as they arise.


We know it is easy to list values on a website. We hope that when you work with us, you will see that we live up to our values. For us, the most important things are:

  • Integrity—We treat our clients and each other with respect. We are honest, and say what we mean. We encourage open debate, and if we think someone is making a mistake, we say so, tactfully. We do not play political games. Once a decision is made, we are committed to following through
  • Intelligence—We are thoughtful. We understand the value of experience, but we also question traditional approaches, looking for better, smarter ways to do things. We need to understand and be able to justify the way things are done – the answer ‘we’ve always done it that way’ is not enough
  • Quality—We always do the best we can. If our best is not outstanding, we find ways to improve
  • Results—We are not interested in analysis for its own sake. Satisfaction comes when our intelligence and experience can be applied to achieve practical results.