Book writer

Hello! I am looking for an experienced book writer to complete a non-fiction book that is more than 200 pages long. This book should be well-researched and cover a specific topic with accuracy and depth. The right candidate should be well-versed in the underlying principles pertaining to the topic chosen. The final output of the project should be a high-quality and professional piece of work. The writer should be willing to collaborate adequately throughout the entire process of completion. Thanks in advance.