Editorial Services

I offer freelance editing for YA and MG fiction (no short stories, graphic novels, or nonfiction, please). I pride myself on my attention to detail and structure alike, as well as my accessibility and friendliness. I will push you to make your materials the best they can be without encroaching on your vision.

Here’s some information about me:

  • I’ve interned in publishing for three years, most recently at Writers House.
  • Before Writers House, I interned at Entangled Publishing, Stonesong, and another literary agency.
  • I’m a volunteer with Beth Phelan’s #DVPit, where I offer free pitch critiques for entrants.
  • Over the course of my career, I’ve had the pleasure of working with multiple New York Times and USA Today bestselling authors, as well as major award winners and nominees (e.g. RITA Awards, Golden Heart Awards, Morris 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 editing 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 of the kind things clients have had to say about my work.
  • I’m happy to work directly with a writer or with their agent or editor.

My editing style is hands-on, and I’m always thinking from two perspectives: an editor’s and a writer’s. As a writer myself, I know how frustrating vague, seemingly arbitrary feedback can be. That’s why I’ll never say, for example, “cut this scene”—instead, I’ll explain exactly why this scene isn’t carrying its weight, how that affects the manuscript, and why it would be better if this scene were removed. I’m also always happy to answer any and all of your questions and help you brainstorm plans of attack for no extra cost. When you hire me, you don’t get a distant, uninvolved editor; you get a publishing professional on your team, ready, willing, and excited to help however he can.

My services, discounts, and contact form are below. Please do get in touch at markobrienbooks AT gmail DOT com if you have any questions. I can’t wait to work with you!

What I offer:

Query edit: $25 (one round; any additional rounds are $15)

I wrote dozens of query letters before signing with my agent, and I’ve read, discussed, and made decisions regarding countless others throughout my internships. I know what works and what doesn’t. When you book me for a query edit, I’ll look at everything from structure and format to diction and punctuation. I offer a thorough critique pointing out areas that need improvement and writing long strings of exclamation points when I love something. Most of all, though, I make sure every word counts—and shines. (Writers aged eighteen or younger: please see below, under “discounts,” for special pricing!)

Submission package: $50 (one round; any additional rounds are $30)

Most agents want sample pages included with your query, and it’s vital that these opening pages draw them in. When you book me for a submission package, I’ll help you ensure the first ten pages of your manuscript—formatted in Times New Roman, size 12, with one-inch page margins all around—and your query letter are the best they can be.

Editorial letter: $0.005/word ($50 per 10,000 words)

Drawing upon my nearly three years of experience writing these for agents and editors, I’ll review your full manuscript and write an editorial letter (two pages minimum, usually more) when you book me for this service. If you’re only concerned about big-picture elements like pacing, character, and plot, this is the option for you! My edit letter will break down what works in your manuscript and how to make it even better, in addition to what needs fixing. I always offer suggestions, too!

Full manuscript line edit: $0.008/word ($80 per 10,000 words)

I don’t like to brag, but I will: many of my clients and bosses alike have praised me for my attention to detail in particular. When you book me for a full manuscript line edit, I’ll review your entire manuscript, leaving suggestions, questions, and hearts in track changes. After noting every problem area I find on a line-level scale and suggesting how to fix them, I’ll ensure you walk away happy with your manuscript.

Full manuscript developmental and line edit: $0.01/word ($100 per 10,000 words)

Selecting this option gives you the same experience as booking me for an editorial letter and a line edit, all for a discounted price—and I’ll throw in two rounds of edits on your query for no extra charge! When you book me for this service, I’ll review your full manuscript with an eye for the big-picture problem areas, which I’ll compile in a comprehensive edit letter. I’ll leave inline notes in track changes concerning nitty-gritty details, too.


I offer 10% off the total cost of any editorial service for marginalized writers, using the definition of diversity found on We Need Diverse Books‘s website. This includes but is not limited to queer (including asexual, aromantic, trans, and non-binary, of course) writers, Native writers, writers of color, disabled writers, and writers who belong to ethnic, cultural, and religious minorities. I go by the honor system on this; you’re free to disclose your marginalization(s) to me if you wish, but I don’t require it.

When I was a teenager querying my first few manuscripts, I could’ve benefited tremendously from a more experienced writer with industry knowledge taking me seriously—but I could’ve never afforded a freelance editor. That’s why I offer free query edits for writers aged eighteen or younger. My feedback will be just as comprehensive as it would be if you were paying. Because I’m aware writers at this age may not have worked with critique partners before, please let me know the ratio of critical vs. complimentary you’d like my feedback to be, e.g. 75/25.


Please submit your information through the form below, or email me at markobrienbooks AT gmail DOT com.

Please be sure to include your manuscript’s word count, a quick summary, and whether any discounts are applicable to you. Again, you don’t need to disclose any specific marginalizations—you could simply say, for example, “I’d like to take advantage of the 10% discount for marginalized writers.”

If you’re eighteen or younger and you’re interested in a free query edit, please email me directly at markobrienbooks AT gmail DOT com with the subject line “Free Query Edit for Young Writer” with your query letter attached in a .doc or .docx file.


*Note: I cannot guarantee you will sign with an agent or be offered a contract with a publishing house as a result of receiving and incorporating my edits.