I’ve spent my entire career in book publishing, beginning as an intern at Entangled Publishing in 2015, six weeks after I graduated high school. From there, I haven’t stopped. I went on to intern and assist at five 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 nerdiness, knowledge, experience, and joy with writers.

I applied for my first internship in book publishing when I was fifteen years old. I set up shop as a freelance editor in 2016. In 2017, I worked on my first client New York Times bestseller, a middle grade fantasy. In 2020, I worked on my first client #1 New York Times bestseller, a young adult fantasy.

Over the course of my career, I’ve had the pleasure of working with many New York Times, USA 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 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, agent, editor, and any member of a publishing team.

Twitter: @bookmarkobrien

Get in touch: hello AT markobrienedits DOT com