"art of the trade" lesson

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tomkoszel

does anyone know the author/creator behind the "art of the trade" lesson on chess.com

I'm really enjoying it & would like to do more

I'm 750 rapid & have recently taken a bit of a ratings dive as I try & study more - but hoping this will pay off in the longer run

Sometimes the lessons can seem too simple for me & plenty of times way too hard. Any recommendations for any challenging/stretching stuff for someone who's trying to improve their chess thinking please?