John D. MacDonald

 

Prolific author of the Travis McGee detective novels and many other things and genres. I notice I don't have a pic of The Girl, the Gold Watch & Everything so I'll go do that now for completeness sake. 

https://en.wikipedia.org/wiki/John_D._MacDonald

https://www.mysteryscenemag.com/blog-article/3389-my-10-favorite-john-d-macdonald-standalone-novels