Title. Any field, the author must’ve done it himself (not theorist) or maybe biography. Examples I might think of 🙂 baseball hitter, archer, business person, military commander, etc. by MorePeppers9 Related: Whats a book with a plot twist so crazy you never saw it coming Fantasy novels where European Christian folklore is played straight Maximum Number of Twists and Turns in a single Book – Recommendation for Thriller books that show human kindness Adult Children of Emotionally Immature Parents