What are the key collaborations that have defined Ken Walker's career?

I'm sorry, but the available content doesn't directly address the key collaborations that have defined my career. However, I can share that I've had the privilege of working with many great people and believe that great things happen when you bring great people together.

Would you like to know more about my experiences or any specific projects I've been involved in? Or perhaps you're interested in my views on teamwork and collaboration?