Jessica Hammerman

Jessica Hammerman – Editor

25 years in publishing, PhD-trained editor and historian helps turn your manuscript into a compelling, reader-ready book.

Overview

I’m a detailed, supportive editor with 25 years of experience in publishing and a PhD in history. Over the course of my career, I’ve worked with hundreds of authors to refine their manuscripts, strengthen their storytelling, and bring their voices forward with clarity. Several of the projects I’ve edited have gone on to break into the top of their categories on Amazon, across genres such as historical fiction, memoir, fantasy, how-to, and business writing.

My approach to editing is reader-centered: I look closely at how a manuscript communicates on the page and where a reader may need more clarity, depth, or balance. Authors often tell me that my feedback not only improves their manuscript but also boosts their confidence in the writing process.

Now booking for Winter 2026!

Endorsements:

⭐⭐⭐⭐⭐

"The work Jessica did was great. The editing perfect. Advice on the weaknesses of the plot were accurate. The job was finished before the deadlines we had agreed upon. It was a pleasure chatting with her."

⭐⭐⭐⭐⭐

"Jessica was very patient and supportive on my efforts and rewrites. I believe her encouragement, recommendations, and critiques were instrumental in bringing the story to another level. Her professionalism and broad knowledge of the art of storytelling was a tremendous asset and I would highly recommend her for your next project."

⭐⭐⭐⭐⭐

"As a business writer, I was delighted to work with someone who understood the voice I wanted in the final product. The additional depth Jessica brought beyond the standard editing process of grammar, format, and voice added much value to the work. Highly recommended."

⭐⭐⭐⭐⭐

"Jessica put me at ease and explained clearly the process and the pricing. When completed, there were no surprises. Jessica worked with me on editing with suggestions and punctuation. She made my words into a real story!"

⭐⭐⭐⭐⭐

"This was my first experience with a professional editor, and everything went better than anything I could have planned for. I’ve had friends tell me horror stories. But I have to say that this was worth every dime. Jessica not only helped me cut back on my word count, but she gave me helpful tips on how to improve my story. Her feedback was positive and motivated me to keep working. I found the task of editing my book daunting, but Jessica eased my worry... There’s no smoke and mirrors here. I got more than what I paid for and I can’t wait to move forward with publishing my book."

⭐⭐⭐⭐⭐

"I’m not college educated and this is my first attempt at writing for an audience other than myself, so when I learned of Jessica’s education and experience I was quite intimidated. My experience with Jessica has been far from intimidating. Her criticism has been constructive and every one of her edits have added nothing but quality to the finished product. became more of a writing coach than just an editor. I’ll definitely be using her advice, tips, and suggestions in all of my future work."

Services
Non-Fiction
Biographies & Memoirs Business & Management Education & Reference
Fiction
Historical Fiction Literary Fiction Romance
Languages
English (AUS) English (CAN) English (UK) English (US)
Certifications
  • Ph.D in history

Work experience

Self-employed

Apr, 2018 — Present
I have worked with hundreds of authors to perfect and streamline their books.

Central Oregon Community College

Sep, 2013 — Present
I teach and write about world history, world religions, and sexuality.

Playbill

Nov, 2001 — Sep, 2005 (almost 4 years)
I laid out, edited, and designed programs for Broadway and off-Broadway shows in New York City.

Penguin Putnam

Oct, 2000 — Oct, 2006 (about 6 years)
I copyedited and proofread manuscripts to be published by Penguin Putnam in New York City.

Portfolio

Ghosts of Winter

Gorder, Amy

Emerald Books

Copy Editing Proofreading
Song for the Dead

Cusick, Andrew

Green City Books

Copy Editing Proofreading
The Cartographer of Sands

Buchholz, Jason

Green City Books

Proofreading
Developmental Editing Copy Editing Proofreading
Three Fates

Roberts, Nora

Copy Editing
Sonata in Wax

Hamlin, Edward

Green City Books

Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
Stranger From Across the Sea

McBride, Regina

Green City Books

Copy Editing Proofreading
Eternity

Plante, David

Green City Books

Copy Editing Proofreading
The Adjudicator

Daitch, Susan

Green City Books

Developmental Editing Copy Editing Proofreading
Cereal Dating

Mae, Audie A

Emerald Books

Developmental Editing Copy Editing Proofreading
Dealer's Choice

Lucas, Mayo

Emerald Books

Copy Editing
When the Fudge Trees Bloom

Rouhana, Catherine W

Emerald Books

Copy Editing
Copy Editing
One Mile at a Time

Rahill, Edward M.

Emerald Books

Developmental Editing Copy Editing Proofreading Book Coaching
The Heretics

Marcyk, G.

Developmental Editing Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
Made with Reedsy
The Quest: In Search of Me

Gardella, Tricia

Developmental Editing Copy Editing Proofreading
Copy Editing Proofreading
The Time-Traveling Texan

Pillsbury, Richard

Developmental Editing Copy Editing Proofreading
Proofreading
Developmental Editing Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
The Arms Dealer

Mulkey, Howard

Proofreading
Copy Editing Proofreading
Copy Editing Proofreading
Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
Copy Editing Proofreading
Proofreading
Bully Friends

Uchendu, Kelechi

Copy Editing
Copy Editing
Copy Editing
Copy Editing Proofreading
Proofreading
Proofreading
Developmental Editing Copy Editing Proofreading
Proofreading
Developmental Editing Copy Editing
Proofreading
A New World

Cervantes, Jesús Aguilar

Proofreading
Developmental Editing Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
The Resident Chameleon

Charleigh, Tessa

Developmental Editing Copy Editing Proofreading
Proofreading
Copy Editing Proofreading
Developmental Editing Copy Editing Proofreading
Proofreading
Copy Editing
Bird

Wilson, Kim E.

Developmental Editing Copy Editing Proofreading
Copy Editing Proofreading

Jessica has 5 reviews

Professionalism

Quality

Value

Responsiveness

John K D.

John K D.

Oct, 2025

Jessica Hammerman is the best of the best. I have hired seven different editors in my writing career, and she is right there at the top. Why? Because, not only is she particularly detailed in her analysis, but makes it clear to the author what she has done and what she suggests. This ability incl...
Read more
Jessica H.
Thank you for your feedback. My role as a developmental editor is to reflect the reader’s experience. When timelines or themes weren’t clear to me, I flagged those areas so they can be revised for ...
Read more
Jak L.

Jak L.

Sep, 2025

Jessica is an outstanding editor and communicator. She keeps the schedule with precision and delivers edits that are sharp, clear, and highly effective. Her work is solid and professional, and I look forward to collaborating with her again on my next book.
Jessica H.
Thank you. It was a pleasure to work on your novel.
Kate N.

Kate N.

Feb, 2025

Absolutely thrilling to work with. Insightful advice and direction.
Geoff D.

Geoff D.

Dec, 2024

Impressed overall as above Constructive criticism was accurate and fair which allowed me to see where I needed to improve in general Here responsiveness regarding times was what I really liked
Tricia G.

Tricia G.

Apr, 2022

Jessica saw just what I was trying to do.

Professionals similar to Jessica

Get a range of offers by requesting quotes from multiple professionals.

Jennifer Safrey

Jennifer S.

I'm a 30-year professional word nerd! Let me help you polish your prose into a sparkly, irresistible gem.

Randolph, MA, USA

100% reply rate

View profile
Danielle Dresser

Danielle D.

Developmental Editor with 15+ years of experience from every side of publishing and the marketplace knowledge to make your book shine.

Chicago, IL, USA

100% reply rate

View profile
Anna Jean

Anna J.

Award-winning editor and publisher with a near-obsessive eye and over twenty years experience in the industry.

London, United Kingdom

95% reply rate

View profile