When Greg Estes retired last year after nearly 16 years at Nvidia to spend more time with his family, walking away from work proved trickier than expected. "It's really hard to go from a job like that, doing amazing things, and you just stop, and you're unemployed, looking at avocados at Safeway," said Estes, who worked closely with CEO Jensen Huang as vice president of corporate marketing and developer programs. Now, he's writing his next chapter at EverGreen — a community of former Nvidia