Cassidy Sachs

Cassidy Sachs – Editor

An editor at a Big 5 publisher with experience editing NYT bestsellers, specializing in adult commercial fiction and narrative nonfiction.

Overview

Hi! I'm an editor with over nine years industry experience. I specialize in adult commercial fiction, particularly in the genres of contemporary, book club, romantic comedy, and women's fiction, as well as adult narrative nonfiction across a broad array of genres including history, politics, and journalism.

I view editing as an exercise in empathy, and love working closely with authors to shape the best possible version of their book to make sure the story they want to tell, the message they hope to deliver, and the empowering perspective they want to share come through clearly.

I am available to provide editorial notes to help at the development stage or a closer line-edit for projects that are further along. I also provide proofreading services for manuscripts that are in need of a final polish. I specialize in long form editorial letters that assess your project's strengths and weaknesses and help you plan for the best path forward.

I am a thorough and thoughtful editor, eager to bring my expertise to your work!

Services
Non-Fiction
Biographies & Memoirs History Political Science & Current Affairs
Fiction
Contemporary Fiction Historical Fiction Romantic Comedy Women's Fiction
Languages
English (US)

Work experience

Penguin Random House

May, 2017 — Present

Portfolio

Kismet: A Novel

Chalsen, Becky

Dutton

Developmental Editing
The Déjà Glitch: A Novel

James, Holly

Dutton

Developmental Editing
Developmental Editing
Eleanore of Avignon: A Novel

DeLozier, Elizabeth

Dutton

Developmental Editing
Sorry for Your Loss: A Novel

McVeigh, Georgia

Dutton

Proofreading
Copy Editing
The World's Worst Assistant

Movsesian, Sona

Plume

Editorial Assessment
Developmental Editing
Out of Love: A Novel

Hayes, Hazel

Dutton

Developmental Editing
Maine Characters: A Novel

Orenstein, Hannah

Dutton

Developmental Editing

Cassidy has 52 reviews

Professionalism

Quality

Value

Responsiveness

Christian E.

Christian E.

May, 2026

Cassidy provided a full-manuscript line edit for my novel after I had completed developmental edits. This was the final stage of revising/editing before I publish, and Cassidy's feedback took my book to the next level. It is clear that she engaged deeply with my manuscript to provide thoughtful s...
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Cara L.

Cara L.

Jan, 2026

Cassidy is a brilliant editor - I have worked with quite a few as a traditionally published and indie author and I would work with Cassidy again without hesitation. Her editorial letter was insightful, market aware and understood what I was trying to achieve and gave me clear directions of how to...
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Emily B.

Emily B.

Dec, 2025

If I could give more than 5 stars, I would. Cassidy really went above and beyond in delivering clear, considerate, and constructive feedback. Her editorial assessment of my novel really showed how deeply she read and thought through my work. What drew me to Cassidy was her genuine love of storyte...
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Sarah A.

Sarah A.

Oct, 2025

Cassidy’s feedback was truly transformative for my novel. It inspired me to reimagine key events and make more intentional choices that enriched the reader’s experience and improved the pacing. I’m still working on it!
Brian H.

Brian H.

Sep, 2025

Working with Cassidy has been an excellent experience. As someone new to writing, I greatly appreciated how clearly she explained each step of the editing process and patiently walked me through it. Her ability to break things down gave me a much better understanding of how to shape and strengthe...
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