Who's Your "Go-to" Guy?

I have come across many different types of people in my field of work and I think one of the most important things I've learned about business is this - a jack of all trades usually really is a master of none. The plain fact is - we all have areas of weakness in business. We all have different skill sets and different areas of work that we enjoy. As I sit back and think about some of the top executives and business people I know, I have come to realize that they do not have all the answers. In fact, I have discovered that they are incredibly skilled in one or two areas, but that they keep the people around them that can help fill in the gaps in the areas which they lack knowledge. These are their "go-to" people. The people they keep nearest in their circle of professionals. These are the people who are most trusted to provide sound, objective recommendations on minor or major situations. I've discovered that it is very beneficial to have a go-to person for each of your major areas of weakness - someone who really has a skill for that area and feels confident and comfortable providing feedback. Most importantly, these key individuals in your inner circle must accept your inabilities and not judge you for your lack of skill, but be willing and excited to help you develop and grow. Who is your go-to guy? Who are the people in your inner circle and do you have a reference person for your biggest weaknesses?