Welcome to Tiller Editing!

Developmental & Copyediting for Nonfiction Authors

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Learn what developmental editing is and whether your manuscript could benefit from it!

Hi! I’m Mary K.

I help nonfiction writers connect with their readers through clearer, more compelling writing.

I’m a developmental editor with a heart for ministry, helping Christian writers bring their message to life with clarity and excellence. I specialize in pulling out the gold in scattered thoughts and turning them into writing that’s clear and organized. My approach is collaborative and prayerful; I care about your voice, your calling, and your message, and I’ll walk alongside you to strengthen both your manuscript and your confidence.

Learn more about me…

My story

Take your manuscript to the next level

Every writer’s journey is unique. Your manuscript deserves a personalized editing plan that fits its needs.

Scroll down to see how my services—from big-picture evaluation to line-by-line polishing—can help prepare your words for the world.

Services
Manuscript Evaluation Tiller Editing
Clarity & Direction

Manuscript Evaluation

Get a clear picture of your manuscript’s strengths and needs. I’ll provide a detailed editorial letter with actionable next steps so you know exactly how to move forward.

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Shape your message

developmental edit

Work collaboratively to strengthen your structure, clarify your ideas, and ensure your message truly resonates with readers. This hands-on process helps your manuscript reach its full potential.

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MK Working Tiller Editing Developmental Christian Nonfiction
Copyediting Tiller Editing
Polish your prose

Line & Copyedit

Polish your prose sentence by sentence for clarity, flow, and consistency. Your manuscript will read smoothly and professionally, and be ready for publication.

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Take the first step

Book a Discovery Call!

Join me for a brief, 20-minute conversation to gain clarity around your project. We’ll discuss where you are in the process, what feels most challenging right now, and what kind of support would be helpful moving forward.

Request a Discovery Call

Kind Words

  • Since discovering Mary K. Tiller and her stellar editing abilities, I find myself writing with much more confidence, knowing I will have her eyes on my work.

    Mary K. is warm, encouraging, helpful, and detailed. She catches things I easily miss and polishes my writing until it shines! If you are looking for an editor…look no further. I promise, you have found one of the best!
    Teresa Whiting
    Author of Graced: How God Redeems and Restores the Broken

  • Before Mary K. was my business partner, she was my editor.

    Mary K’s instincts as an editor are spot-on. She has this remarkable ability to think strategically about my message while offering thoughtful edits that make my writing shine. At the same time, she cheers me on as a writer, building my confidence and creativity with every suggestion. She doesn’t just polish my work, she brings out the very best in me. I honestly don’t know where to begin thanking her for all she’s contributed to my books.
    Sandy Cooper
    Author and POdcast Host
    of the Balanced Momcast

  • My work is measurably stronger because of her.

    Working with Mary K. felt like collaborating with a trusted coach who draws out your strongest writing while refining your voice and discipline along the way. She brings warmth, discernment, and clear direction to every stage of the process. My work is measurably stronger because of her, and for that, I’m forever grateful!
    Bekah Buchterkirchen
    Author

  • Finding Mary K. was a dream come true and an answer to prayer.

    Her dedication to understanding the vision for my project and her willingness to create an editing system that worked for me and my team meant clear communication and easy back-and-forth. Collaborating with Mary K. undoubtedly took my Bible study to a higher level of excellence.
    Angie Baughman
    Founder of Steady On Ministries

  • Mary K. is a pleasure to work with.

    Not only is she completely knowledgeable with editing a piece of work, but she engages herself to connect with her client’s writing. She comments with encouraging words and also critiques the writing so professionally. She is flexible and communicates well all around.
    Tracey Breinich
    Author of Shadows and Salvation

  • Mary K. is exceptional.

    She will make your dream come true.
    Juan Carlos Del Valle
    Author of “Forged in Flames”
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