Duke Castle

Senior Associate, The Natural Step

Duke Castle was part of a group that introduced the Natural Step sustainability framework to Oregon in 1997. The group’s goal was to show business and community organizations how they could move toward creating a sustainable society while maintaining a healthy economy. Since then he has been prominent in teaching organizations how to effectively integrate the Natural Step sustainability framework into their business planning and strategic operations.

He has conducted over 400 sustainability trainings and briefings throughout the State of Oregon and other parts of the Pacific Northwest. In 2000 he was asked to train Oregon state leaders on sustainability and The Natural Step as part of Governor Kitzhaber's sustainability executive order.

Duke’s business experience includes ten years as a marketing manager at Hewlett Packard and fifteen years as a strategic planning and marketing consultant. He has a BS degree in electrical engineering from Cornell University and an MBA in marketing from Stanford.


  • M.B.A., Stanford University
  • B.S., Cornell University