Simple ... experience.
I will state it right up front, I am not the cheapest freelancer you will find. Then again I am far from the most expensive. Many of the companies I have worked for have charged $150/hour and more for my services. I bring with me the experience of leading over fifty projects (and tens of millions of dollars) to successful completion, but not the overhead, allowing me to charge a fraction for my work.
The following list is not exhaustive. If something falls outside of my expertise, I have an extensive network of colleagues I have worked with extensively available to provide solutions for all of your needs.
The following is a sampling of the hundreds of clients I have worked with over the years.