UX Leadership Model
It comes from none but Leah Buley (Adaptive Path, author of “The UX team of One”), which in turns builds upon a model from David Sherwin and Justin Maguire (Frog).
In her very short but great article she touches on a few points that usually come up in the initial conversations with a client, especially when they call us for UX training.
Source https://solmesz.medium.com/the-ux-practitioner-pyramid-69949720e09c
Other references
https://www.invisionapp.com/talks/ux-leadership-everyone-designs
https://hbr.org/2014/04/design-can-drive-exceptional-returns-for-shareholders
https://www.slideshare.net/jenvetterli/ux-career-development