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Hello:
I picked up this book at a yard sale and was surprised to see a sig in it.
This is his book that he wrote with his wife.
I am not 100% sure if it's authentic or not.

I think it might be Suzy Welch's signature.

Any help is greatly appreciated.

Sorry to disappoint you, but this is neither Jack Welch's nor Suzy Welch's signature. It's probably just an inscription to whom the book may have concerned and signed by the person who gave it away as gift. Below find examples of Jack and Suzy Welch signatures.