Some of the greatest stars in the history of football have been under contract with Puma.

When you are small, and you have to try and prove yourself, it is tough. When others are catching up and copy you, that's tough. We constantly need to change ourselves to stay ahead of the game.

The B Team can catalyse initiatives.

It may sound crazy, but maybe there's an economic way of producing a leather-like product in the laboratory.

I call upon governments to start supporting companies to use more sustainable materials in their products instead of continuing with antiquated incentives, such as import duties on synthetic materials that are in principle much higher compared with those placed on leather goods regardless of the environmental footprint.

Governments have a unique opportunity to incentivise corporations so that they can accelerate their evolution to a more sustainable economy through more sustainable practices and products.

Look at timber prices in the late '90s, at around $50. If you count the true damage of cutting down forests, the resultant flooding, insurance claims, and so on, then the timber price should have been $100.

I think South Africa has shown it can host such a big event as the World Cup, so why not hold the Olympics at some point in Africa? Maybe not just in one country but in a host of countries.

I never felt that although we were based in Germany, Puma was and should be considered as a German brand. So we restructured it in a way that positioned us as a global brand, with English being the corporate language, rather than us looking at it from a German perspective.