Question: One on One is by what American author and acitivist, who is married to author Steven King?

Context articles: The Seven Wonders (Saylor novel)
A Gladiator Dies Only Once
The Warrior Ethos
The War of Art (book)
Tabitha King
The Triumph of Caesar
The Judgment of Caesar
Edwin Mullhouse
A Mist of Prophecies
One on One (novel)

The Seven Wonders is a historical novel by American author Steven Saylor, first published by St. Martin's Press in 2008.
 It is the thirteenth book in his Roma Sub Rosa series of mystery stories set in the final decades of the Roman Republic, although it is chronologically the first.
 The novel is made up of a series of connected short stories, and the main character is the Roman sleuth Gordianus the Finder.
A Gladiator Dies Only Once is a collection of short stories by American author Steven Saylor, first published by St. Martin's Press in 2005.
 It is the eleventh book in his Roma Sub Rosa series of mystery stories set in the final decades of the Roman Republic.
 The main character is the Roman sleuth Gordianus the Finder.
The Warrior Ethos is a 2011 non-fiction book by American author Steven Pressfield.
 It is a unique-style narrative in which Pressfield contemplates the nature of the warrior code and the rules by which a warrior, even a metaphorical one, must follow.
 He relates several examples from history from the stand of the Spartans at Thermopylae to the defeat of the inner vices as described in the Bhagavad Gita.
The War of Art is a 2002 non-fiction book written by the American author Steven Pressfield.
 Within it, Pressfield highlights the different forms of Resistance faced by artists, entrepreneurs, athletes, and others, who are trying to break through its barriers.
Tabitha Jane King (née Spruce, born March 24, 1949) is an American author and activist.
 She is married to the author Stephen King.
The Triumph of Caesar is a historical mystery novel by American author Steven Saylor, first published by St. Martin's Press in 2008.
 It is the twelfth book in his "Roma Sub Rosa" series of mystery stories set in the final decades of the Roman Republic.
 The main character is the Roman sleuth Gordianus the Finder.
The Judgment of Caesar is a historical novel by American author Steven Saylor, first published by St. Martin's Press in 2004.
 It is the tenth book in his Roma Sub Rosa series of mystery stories set in the final decades of the Roman Republic.
 The main character is the Roman sleuth Gordianus the Finder.
Edwin Mullhouse: The Life and Death of an American Writer 1943-1954, by Jeffrey Cartwright is the critically acclaimed debut novel by American author Steven Millhauser, published in 1972 and written in the form of a biography of a fictitious person by a fictitious author.
 It was Millhauser's best known novel until the publication of his Pulitzer Prize-winning "Martin Dressler" in 1997, and according to Patrick McGrath writing in "The New York Times" it is his best work.
 "Edwin Mullhouse" is described by "Publishers Weekly" as a 'cult novel'.
A Mist of Prophecies is a historical novel by American author Steven Saylor, first published by St. Martin's Press in 2002.
 It is the ninth book in his Roma Sub Rosa series of mystery stories set in the final decades of the Roman Republic.
 The main character is the Roman sleuth Gordianus the Finder.
One on One is a 1993 fiction novel by author Tabitha King, set in the fictitious New England town of Nodd's Ridge.
 The book was published by Dutton Adult.