How much is the owner of Trader Joe's worth?

I'm curious to know, how much is the estimated net worth of the owner of Trader Joe's? With the success and popularity of their grocery chain, it's natural to wonder about the financial status of the individual behind it all. Do they hold a significant stake in the company, and if so, how does that reflect on their overall wealth? It would be interesting to get a glimpse into the financial picture of this successful entrepreneur.