Editor's Profile

Katrina Diaz Arnold

Katrina Diaz Potential Profile Photo

Katrina Diaz Arnold is an editor and writer with more than six years of professional publishing experience, who has a soft spot for brave new worlds, fresh plot twists, and strong complex protagonists. She abashedly loves a battle between good and evil, particularly if it’s more gray than black and white, and loves stories that utterly transport a reader, whether it’s into an original world, a thrilling mystery, or a character’s perspective.

Previously part of the editorial team at Scribner, an imprint of Simon & Schuster, Katrina has worked on numerous New York Times and international bestselling works, including Woman of the Dead by Bernhard Aichner, Until I Met Her by Natalie Barelli, and The Dragon Behind the Glass by Emily Voigt. She’s edited works of mystery, thriller, memoir, and narrative nonfiction, and also contributed to such works as Jan Russell’s The Train to Crystal City, Andrew Meredith’s The Removers, and Jennifer Ridha’s Criminal That I Am.

After leaving the Big Five to start her freelance career, Katrina dedicated herself to editing a wider array of genre fiction - a deep-seated passion of hers. She’s since established herself as an editor of mystery, thriller, fantasy, science fiction, dystopian/post-apocalyptic fiction, and romance. An experienced developmental and line editor, Katrina is wholly devoted to any project she takes on and is committed to bringing manuscripts to the next level. She loves nothing more than helping an aspiring author refine their work into the best, most vibrant version of itself. Her work has been described as “inspired,” “insightful,” “meticulous,” and “goes above and beyond” by her authors.

Katrina's select booklist can be found below. Here are a few of her testimonials:

“Working with Katrina was a wonderful experience. She took the time to read my novel and asked me questions to help deepen it. She provided a keen editorial set of eyes. Katrina was able to use the same voice as my characters when she suggested additions and rewrites; I was amazed at her editorial skills. Her suggestions blended seamlessly into my novel. She polished my novel in a way that I didn't think was possible, but still kept the voices and story intact. She also improved the readability and the flow of action just by rearranging sections and rewording clunky parts. I'm grateful for the chance I had to work with her on my novel. I now feel confident that it's the best it can be. Katrina is a gem, and she's the editor you need if you want your novel to sparkle and shine.”

— Rachel Hunsaker, author of Night Bloom

"It was fantastic working with Katrina. Her structural edit did wonders for my novel. I really liked how thorough and specific her suggestions were, and I was thrilled with the result. And she's lovely to work with. I can't wait to do it again."

— Natalie Barelli, author of Until I Met Her

“Katrina is a joy to work with. She’s professional, prompt, and she worked very hard to make my story shine. She can handle both developmental and line edits with ease. I didn’t feel like I was adrift at sea after reading her memo; I felt like I had a handle on how to chart a new course to fix the problems she identified. When I needed additional help, she was patient and kind. I’ve already booked her for my next book. Higher praise I cannot give.”

— Jenna Barwin, author of Dark Wine at Midnight


“This being my first manuscript and first time working with an editor, I really didn't know what to expect from the process. Having now been through it I am glad I chose to go with Katrina. From the beginning the process was outlined thoroughly, extra care was given to bettering the manuscript to its best possible form, and Katrina's overall engagement was the story was great. As a first time author especially her guidance was very educational. Highly recommended!”

— N.B. Austin, author of Crimson River

“Katrina Diaz was an invaluable partner when polishing my first manuscript. I wasn't sure what to look for in an editor, and I had a hard time finding the right person to really sink their teeth into my dark fantasy story, but her samples really put me at ease and let me know I was in good hands. When I received her editorial assessment and developmental edits, I knew I'd picked the perfect editor.

She gave me productive criticism and reactions while staying respectful to the prose, and she never compromised my style or flavor with her edits. Most importantly, she pointed out a book-breaking character issue that I never noticed in my own reviews! It's safe to say that Katrina saved my manuscript, and I'm really proud of the state it's in going forward.

Katrina truly goes above and beyond what I would expect from an editor, and I know my work wouldn't be in nearly this good of shape without her insight and expertise.”

— Dave Oliver, author of Ez Ozel: Prologue to Perdition

“Finding a good editor is very difficult, finding an excellent one is nearly impossible. Katrina’s attention to detail was superb. Her input helped smooth out the story like a steamroller on hot asphalt. I thoroughly recommend her services to the discerning author who requires absolute professionalism and quality.”

— Jack Coleston, author of The Ulterior Motive

"I'd heard good things about Katrina's editorial prowess, and the reports were true. We agreed upon a custom editorial assessment for my thriller manuscript, and Katrina provided not just a high-level report—an overview assessing the manuscript's plot clarity, character arcs, pacing, and structure—but also a detailed critique that identified not just shortcomings but opportunities to make it a much stronger work. I would wholeheartedly recommend Katrina for any author, whether you're new at this game or a grizzled veteran looking for smart, knowledgeable input."

—J.D. Lasica, author of Biohack

“Katrina is an editor that can make your story even more captivating while keeping your literary voice. From helping to develop the plot, characters, tone, and individual word edits that are of publishing quality, I highly recommend her services for any and all your editing needs. Her expertise and knowledge gives you the edge to get your manuscript noticed in the competitive world of literary agents and publishers.”

— Marsha Volgyi, author of The Crewmember


"I would just like to take a minute and thank my editor, Katrina Diaz, for all the time and attention she has given to my work. Her attention to detail is brilliant, and she has a keen intuition into what an author is going for, in regards to narrative style. She gives her whole heart to what she does and I know there is no way I would be releasing this book without her insight to help navigate me in the right direction."

—Tia Day, author of Lucy's Legacy


"Katrina was absolutely wonderful. She took the time to truly understand the plot, the motives of my characters, as well as the overall story I was trying to tell. My novel is infinitely better because of her thoroughness. She collaborates very closely with the authors to try to completely understand the voice they are trying to give their characters, and works hard to help them jump off the page!"

—Ray Robbio, author of The Alters

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