About Me

I’ve spent my entire career in book publishing, starting as an intern at Entangled Publishing in 2015. From there, I went on to intern and assist at four literary agencies, including Stonesong, Triada US, and Writers House. Currently, I’m a Sales Assistant at NetGalley, working with independent authors and publishers. On the side, I’m a freelance editor and sensitivity reader. I’m a book nerd and a book publishing nerd, and I view my editorial services as a way to share that nerdery, knowledge, experience, and joy with writers.

I applied for my first internship in book publishing when I was fifteen years old. I began my first internship in book publishing six weeks after I graduated high school, and from there, I haven’t stopped. I set up shop as a freelance editor in 2016. In 2017, I worked on my first New York Times bestseller, a middle grade portal fantasy. In 2020, I worked on my first #1 New York Times bestseller, a young adult epic fantasy.

Over the course of my career, I’ve had the pleasure of working with many New York TimesUSA Today, and indie bestselling authors, as well as major award winners, nominees, and finalists (including the William C. Morris Award, Printz Award, National Book Awards, Coretta Scott King Book Awards, Boston Globe-Horn Book Awards, and E.B. White Read-Aloud Awards).

I’ve volunteered with Beth Phelan’s #DVPit, where I offer free pitch, query letter, and first page critiques for entrants.

I’ve worked with editors at Big Five publishers on their authors’ developmental and line editing on a freelance basis.

I’ve edited for authors who have gone on to sign with agents and sell their manuscripts to publishers. Here are some kind things a few clients have had to say about my work.

I’m happy to work directly with a writer, with their editor, or with any other member of their publishing team.

Twitter: @bookmarkobrien

Get in touch: hello AT markobrienedits DOT com

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