Does playing Chess help with ones concentration and approach? Yes.
Does being good in Chess help with being good in Poker? Maybe.
Is it a foundation? No.
We are comparing oranges and apples here, really. While this 2 games do share some similarities, they are completely different games. People might fall into this trap of thought, since strategic people love to play chess, love to analyze opponents play and outsmart them and hence love to play poker for the same reasons. So you might find a lot of people in this specter who play both... so surely there must be a connection?
Well there is. If you love strategy games, you will most likely at least have tried both and many other that exist in our world. I for one am this kind of person. I played strategic computer games like Warcraft series, Starcraft series, Age of Empires series, Heroes of Might and Magic series, ect ect. and board games like Chess, Poker, Magic the Gathering, Tarok, Risk, Catan... heck even Monopoly is a strategy game, that I would recon is more similar to Poker than Chess. So is Monopoly a foundation for Poker? Heck no.
So to sum it all up. Yes, while people who play Chess might have easier time adapting to Poker, due to both of them being strategic games, Poker is a stand alone game and should be taken like that. You won't be building up on your Chess knowledge and upgrading it into Poker knowledge (there is where I think you might want to put this foundation word into effect). You will just draw from your real life experience and try to incorporate it into playing the game you play better.
So really, your life and experience is a foundation on which you build everything, not just poker. Don't blind yourself by thinking that being good at one game will always translate to being good in another, even though they might share similarities.