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ⓘ About John McMahon
John McMahon is a popular American writer of mystery, suspense, detective fiction, and thriller stories. He is particularly famous for writing the Detective P.T. Marsh novel series. Before becoming a writer, McMahon used to work as a creative director at an advertisement agency. In this role, he has written a spot for Superbowl for Alfa Romeo. Also, McMahon’s work in creative direction for Fiat has won him a Gold Clio. Author McMahon has obtained a degree in Creative Writing from The University of Arizona. After successfully writing and publishing two P.T. Marsh books, he is currently at work on his third novel. McMahon is happily married and resides in Southern California. His family comprises of his loving wife, kids, and a couple of rescue animals.
All Book Series by John McMahon
? Frequently Asked Questions
Who is John McMahon?
John McMahon is a popular American writer of mystery, suspense, detective fiction, and thriller stories. He is particularly famous for writing the Detective P.T. Marsh novel series. Before becoming a writer, McMahon used to work as a creative director at an advertisement agency.
Which John McMahon series should I start with?
The best place to start is the Detective P. T. Marsh series, the earliest of John McMahon's multi-book series: it opens with The Good Detective (2019) and runs to 3 books across 2019–2021, ending with A Good Kill (2021).
How many books has John McMahon written?
John McMahon has 5 books catalogued in this guide, published between 2019 and 2026. Every one of them sits in one of 2 named series — the largest being the Detective P. T. Marsh series with 3 books.
In what order should John McMahon's series be read?
Read each series in publication order — the numbered entries in each series follow the year each book first appeared. John McMahon's series do not depend on one another, so they can be started in any order; by start date they are Detective P. T. Marsh (2019–2021, 3 books) and Head Cases (PAR Unit) (2025–2026, 2 books).
How are John McMahon's books organised into series?
This guide splits John McMahon's 5 books into 2 named series, with no standalone titles: Detective P. T. Marsh (3 books, 2019–2021); Head Cases (PAR Unit) (2 books, 2025–2026).