Helpful vs. Unhelpful Managers

I believe a great example of a helpful manager is my current supervisor. He is always challenging me to be my best. I am definitely not the same individual as I was when I started working for him back in 2008. He is also the one who convinced me to go back to school for my degree and being in this class right now. I may not like some of the advice that he has given me over the past 5 years, at the time of delivery. But I always come to realize that he is right, and that it's the best advice for me that could be given at that time. By listening to the advice and paying attention to our mentoring sessions, I’ve gained acknowledgement from other managers, as well as a higher respect level from my co-workers, which creates a greater work environment for all involved. What made me realize that he was a helpful manager, was actually writing this paper. Plus the fact that I received a promotion that I had been working toward for 6+ years by following his advice and mentoring tactics. Which I am now attempting to share with my subordinates in my group to help them advance as well. So maybe in time, I could be a helpful manager.
An example of an unhelpful manager that I have had would be my previous supervisor, Or as I like to refer to him as “Mr. Personality”. The only thing that appeared to matter was “did the work get done today?” Not so much of the nurturing type (professionally, and personally speaking). He did not seem to care if anyone in his group advanced in their career, or made anything of themselves. Don’t get me wrong, he was not the type to sit back and bark orders. He knew he had a good group working for him and the work would get done in a timely manner and with the utmost quality. But helpful he was not. I believe the only thing that mattered to him was how good his group could make him look in day to day activities. Which seems like a very selfish attitude to have as being in a supervisory / managerial position. While working under this