Bob Haro has been called the father of freestyle. He started his company by making number plates on his stove at home, as well as doing illustrations for magazine Bicycle Motocross Action. Now the company is under new ownership. Bob helped many great riders get started. Team riders like Dave Nourie, Rich Sugur, Rick Molinterno and so many others. The early frames were made by Torker, with the distinctive twin top tube.
More specific Haro info, check out the book:
How to Rear SN's: