Susan Dell, married to Michael Dell, Dell CEO

Whilst Michael Dell is busy running his company, his wife Susan Dell is up and about accomplishing many of her own things as well. She is the Chairman of the Michael & Susan Dell Foundation, dedicated to transforming the lives of children living in poverty around the world. Susan Dell is also chairman of Phi, a New York City-based women's designer label that has had runway shows and has even been featured in Vogue.

To top off all of her daily responsibilities, she still manages to finds time to run, literally. Susan competes in marathons, triathlons, and cycling races, her greatest achievement having successfully competed in the 2003 Ironman World Championships. This is really a super woman not to be trifled with.