"Mireille is the kindest and definitely in the top two most knowledgeable people we know in publishing. As first time authors, we were naturally scared of the whole process and didn't know where to start. She did something no one of her position would do. She got on a call with us for a long time, made us feel at home about becoming authors and shared so many nuggets that not only helped to build our confidence that we could become authors, but it helped us shape what type of book we wanted to write. She also helped us understand which publishers to consider and why and what the whole process looks like. Today, we're Sunday Times Bestsellers of our debut book titled, Financial Joy. Although Mireille wouldn't claim to have helped, we credit a big part of our success to her crucial support at the start."

Ken and Mary Okoroafor, multi award winning founders of The Humble Penny and Financial Joy Academy, and Sunday Times bestselling authors of Financial Joy (Quercus | 2024)

"If it wasn't for Mireille I would never have written my first non-fiction book, or got my first book deal. As a freelance journalist who doesn't have a background in publishing, Mireille supported me in the development of my book proposal, reading and editing my draft chapters, and even connected me with my agent. I am indebted to her endless support, and her consistent championing of underrepresented voices speaks for itself."

Adele Walton, now represented by Bergstrom Studio and soon-to-be-published author of Logging Off (Trapeze Books, Orion | 2025)

I cannot imagine my literary journey to being an agented author without Mireille C. Harper. She has always championed my work both as an artist but also as a writer. I have always loved books and writing however, I gave up on being writer a several years ago because of bad mentorship and bad guidance. But when another project I was working on fell through, Mireille encouraged me to consider writing fiction again. She introduced me to my now agent and has been incredibly supportive, discerning and generous with her time, advice and technical know how. Mireille distills complicated and nuanced information about the publishing industry in an accessible way that means that anyone can engage with the information that she is sharing. She does all of this with an intentional, considered approach that is detail oriented and care driven. The magic of Mireille is her sincerity and ease - you feel a sense of calm when you are talking to her. I can try to explain more but you'll have to see it for yourself - she is truly exceptional.

Deborah Shorindé, now represented by The Good Literary Agency

"Mireille is a creative and dynamic individual with a real gift for understanding authors and agents alike. She has vast knowledge of the publishing sector and makes culturally appropriate, sensitive and thoughtful recommendations to support individuals looking to progress their work. Mireille has both an instinctive knack for getting underneath the skin of manuscripts and a unique ability to match an idea with a place looking to promote it. She’s more than a safe pair of hands, she’s an advocate for progress in the publishing industry, and I’m so grateful for the way she has supported me in my career to date."

Leah Brown, now represented by Watson, Little

“Mireille has helped me tremendously with my understanding of the publishing industry; and it is thanks to her invaluable advice that I now have an agent and representation for my writing. Despite my dreams of becoming an author, I’m embarrassed to say that I absolutely no idea where or how to start, let alone who to speak to or how to present my ideas. Mireille went above and beyond in helping me understand the many, varying publishing processes. She also connected me with others within the industry, including my now agent. Mireille gave me detailed and practical advice on how to put together a proposal, alongside feedback on my initial ideas for a book. I will be forever grateful for Mireille’s help, time and support.”

Chloe Lovell, now represented by WME

"I’ve wanted to become a published author since I was 8 years old. Since then, I have spent 20 years speaking with authors, publishers and agents to get a sense of how I might make this happen. Mireille is the only person who has provided me with concrete tools to make this dream into a reality. Since I first told her of my dream, she has been nothing but supportive, helping me tease out ideas, figure out how to draft a book proposal and providing incisive and precise edits and comments to help me further refine my work. She has also connected me with publishers and agents and helped me tailor submissions to ensure they don’t get buried in agent sift piles. Most importantly, Mireille has been there to pick me up in the moments where I feel like giving up and has been a consistent advocate for me and my work. I am grateful to have met her. Mireille is a one-of-a-kind consultant who is able to locate a star in everyone and ensure it shines bright for all to see."

Seun Matiluko, freelance writer, now repesented by C&W

"Mireille has been one of the most positive forces in the publishing industry that I've come across. Offering enthusiasm, expert knowledge, and years of experience, Mireille truly opened my eyes to a whole new world of possibilities. She explained key components of the industry in such a succinct and accessible manner, that I feel I am moving forward with my career with a sense of clarity and direction. Mireille is open, engaging, and always happy to lend a helping hand, connecting me with vital peers. I know as I take my next steps, her advice will ultimately continue to be game-changing."

George Chrysostomou, freelance writer

"Mireille Harper's guidance has been invaluable to me during a time when I felt lost in my publishing career. Her generosity and insights have helped me to gain clarity on my path and what I need to do to bring my book to readers. She is a true beacon of light, and I feel grateful to have learned from her."

Alexa Grier, author of Take Back Your Power

“Just an hour with Mireille did two massive things for me; 1. Rejuvenated my confidence that not only did I have a good idea for a book, but that I am most definitely the right person to write it. 2. Grounded me in the realities of writing and publishing, allowing me to realistically consider what my next steps could and should be. I would highly recommend working with Mireille - she provided a safe environment of high support and high challenge - priceless in my view!”

Sammy Burt, founder of Your Backpack

“Mireille has been instrumental in helping me to navigate the publishing industry. She also has given me essential pointers and notes on writing as an newbie in this business. and it is thanks to her invaluable advice that I now have an agent and representation for my writing. She is a generous professional, always connecting others and creating bridges."

Isabel Sachs, founder of I Like Networking

"There are very few people on Earth that I trust with my writing and Mireillie is, without a doubt, at the top of that list. Her feedback is compassionate, direct and encouraging. She truly aims to build you up as a writer and, with every word, you feel how much she wants you to succeed. Her insight into the publishing industry has been invaluable and helped guide my own aspirations on countless occasions. There's no one I feel safer working with than her, and I hope to continue to do for years to come."

Inês Mendonça, freelance writer

"Mireille has been welcoming from the beginning, offering invaluable advice and support as I navigate my opportunities as a new writer finding my way in the industry. She is genuinely kind, caring, and always a pleasure to reach out to.”

Johanna Düring