I had an amazing opportunity to work on Apple and it's where I learned the importance of having a defined and recognizable brand voice. Since then, I've worked on a good number of voice and tone guides and style guides.
I've helped teams understand the difference between voice and tone and how to work collaboratively with design/UX to produce style guides. A few of the brands I've developed voice and tone guides for include Verizon, Sapient, Samsung and a few others. Want to see one of them? I'm happy to show you a few in person.