How can i take an assist from book writer specialist?

My father's friend is an architect, who creates the overall look of houses, buildings, and other structures. He has extensive experience and has worked in this field for a very long period. He intended to publish a book about his line of work, but he lacks the time to devote to it. One of her clients told her of a professional book writing service in the US that could help him put it down on paper. Who has had a job at this business?