Marc Wallert

Marc Wallert talks about resilience and trust. Marc Wallert is now available with The Premium Speakers Agency.

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© Stephanie Wolff
20. July 2020 – Mandy Weinand

Marc Wallert – Don’t lose your head: Positive thinking can be deadly!

 Yes, positive thinking can be deadly! And I say that, Marc Wallert, as a self-confessed optimist. Why? Because I experienced…

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