In addition to his Shark Tank persona, Kevin O'Leary (aka Mr. Wonderful) has a long career in business that has earned him the right to have such a bold voice on the program.

Lori Greiner is the host of "Clever and Unique Creations by Lori Greiner" (product development and marketing.

When Cuban became a billionaire, he made a major shift in his investment strategy.

Original Shark Tank Cast: Who Are the Sharks on The Shark Tank Cast?