Joe Hendrickson, founder and CEO of Hendrickson Tree Care in Kansas City, Missouri, worked for his father's tree service company before he went out on his own in 1985. "I sold my van, bought an old Ford truckand started trying to hustle tree work," he says. "A couple of years later, I joined ISA and went to a conference in Colorado and realized I didn't know anything. That was the beginning of my education."
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