Jonathan Westmark

Jonathan Westmark – Editor

10+ years in children’s publishing. Former executive editor at Albert Whitman & Co.

Overview

I am an experienced children's book editor specializing in character-led middle grade and YA, chapter books, social-emotional picture books, and children's nonfiction.


Previously, I was Executive Editor at Albert Whitman & Company, where I acquired, commissioned, and edited books across all children’s age categories and genres. Projects I've worked on have been named best books of the year by Kirkus Reviews, Bank Street College, and School Library Journal and have received the Lambda Literary Prize, the Minnesota Book Award, and the National Jewish Book Award, among other accolades.


Having come from an indie press, I've worn a variety of hats during my career. I’ve edited bestselling authors, spoken at conferences, and led a department. I’ve also been the one to alphabetize indexes, identify the perfect BISAC code, and empty the company dishwasher.


Throughout, I’ve been humbled by the care and creativity authors have shown as they help readers better understand themselves and the world around them. As an editor, my goal is to manifest that same level of care and creativity in your project. Whether providing feedback on syntax, story structure, or something in between, I'll approach your manuscript on its own terms, helping you to achieve your editorial vision in a way that meets readers where they are and resonates deeply.


I'd love to hear about your project and editorial goals. Drop me a line, and let's discuss.


Testimonials:

“So many thanks to my editor, Jon, who believed in my story about a quiet, introverted girl. I’m so thankful for all the work you did helping me get Lilla to sound exactly like herself.”

—Amy Noelle Parks, award-winning author of Summer of Brave


“Jon is a truly remarkable editor who asks all the right questions”

—Anna Humphrey, award-winning author of Megabat

Services
Non-Fiction
Children’s Non-Fiction
Fiction
Coming of Age Middle Grade Picture Books Social & Family Issues
Languages
English (US)

Work experience

Self-employed

Feb, 2023 — Present

Copy edited, proofread, and fact checked children’s content for trade and educational markets.

Albert Whitman & Company

Jun, 2021 — Jan, 2023 (over 1 year)

Acquired, commissioned, and edited twelve to fifteen books per year; fostered the development of a team of editors; and worked closely with the art director, publishing director, and sales and marketing teams to establish acquisitions strategy.

Albert Whitman & Company

Jan, 2021 — Jun, 2021 (5 months)

Acquired ten to twelve books per year; developed original IP chapter book series. Maintained the company style guide; trained and supervised in-house copy editor and proofreader.

Albert Whitman & Company

Feb, 2019 — Jan, 2021 (almost 2 years)

Managed the well-loved Boxcar Children brand—concepting, outlining, and editing books for existing formats and developing new product lines for print and media. In coordination with literacy experts, helped launch Time to Read, the company's line of early readers.

Albert Whitman & Company

Oct, 2016 — Feb, 2019 (over 2 years)

Acquired six to eight books per year. Served as the in-house copy editor and proofreader.

Red Line Editorial

Sep, 2014 — Oct, 2016 (about 2 years)

Edited or wrote approximately forty nonfiction children’s books per year for educational publishers. Supervised freelance copy editors, proofreaders, fact checkers, indexers, and subject-matter experts.

Portfolio

Summer of Brave

Parks, Amy Noelle

Developmental Editing
Quack

Humphrey, Anna

Developmental Editing
Proofreading
Proofreading
Developmental Editing
Developmental Editing
Copy Editing
Developmental Editing
Developmental Editing
Dear Mr. Dickens

Churnin, Nancy

Copy Editing
Developmental Editing Copy Editing
Proofreading
Developmental Editing Editorial Assessment
Developmental Editing Editorial Assessment
Proofreading
Call Me Calvin

Vander Plas, Mary

Developmental Editing Editorial Assessment
Developmental Editing
Developmental Editing Editorial Assessment
Developmental Editing
Developmental Editing
Developmental Editing Editorial Assessment
Developmental Editing Editorial Assessment
Room of Shadows

Kidd, Ronald

Proofreading
Developmental Editing Editorial Assessment
Copy Editing
Copy Editing
Developmental Editing
Developmental Editing
Developmental Editing
Developmental Editing
Developmental Editing
Developmental Editing
Developmental Editing
Proofreading
Copy Editing
Copy Editing
Copy Editing Proofreading

Jonathan has 1 review

Professionalism

Quality

Value

Responsiveness

Edward J.

Edward J.

Jun, 2024

Jonathan is very knowledgeable and had great input. The ideas and brainstorming left me with a fresh perspective and renewed excitement towards my work. Jonathan took the time to really get to know my manuscript and spoke about the characters and world as though he were familiar with them for years. All of Jonathan's feedback, positive and negative, were delivered in a professional and const...
Read more

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