I've had several great bosses through the years. Ones who considered teaching me and developing my skills/career to be part of their primary job duties instead of feeling threatened. I learned a ton from them.

My current boss is also amazing. I'm a nurse at a hospital that just unionized, and she really puts her job on the line to make sure we have what we need to keep the patients on our unit safe. She's a lot of the reason I didn't quit a long time ago.