I don't think I can pick just 2. Just about everyone there from the mechanics, drivers, team princpals, PR, health care and everone else has had to wok very hard to reach that point in their career that they can say they have made it to F1. There are personalities associated with F1 that I may not like, but I have to respect th person for having been able to make it that far in the first place. There are some people there that I admire more than others, because not only have they reached the pinacle of their career, but they have pushed the standards further than othersthrough dedication or pure talent.
Frank Williams - I have heard him speak at a dinner in the past, an amazingly likable personality with a tough life even now. He never gav up on hi dreams and worked through every obstacle that life or anyone else could throw at him in order to achieve what he has.
Adrian Newey - What does this man have that other designers don't? I am not sure we will ever answer that question but he has a vision that has created some of the best cars in recent years, but lets not forget that he has also managed to create some of the worst, but stuck with it until he got it right.
Ron Dennis - Say what you like about him, he had a vision, he went about achieving it. Not only in F1 but in industry as a whole.
I could go on for some time about everyone, but those would be the top of my list for admiration in what they have done. This is just those still around today, the history of F1 is littered with people who have achieved as much and more.