About This Book

Publication

Published in 2026 by OneStream Press.

Copyright (c) 2026 OneStream Software LLC, All rights reserved.

OneStream and the OneStream logo are trademarks of OneStream Software LLC, www.OneStream.com, and used with permission.

ISBN: 9781068333842

All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publisher.

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OneStream Press has endeavored to provide trademark information about all the companies and products mentioned in this book by the appropriate use of capitals. However, OneStream Press cannot guarantee the accuracy of this information. OneStream Press is an imprint of Play Technologies (England) Limited. 6 Woodside, Churnet View Road, Oakamoor, ST10 3AE, United Kingdom.

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Disclaimer

While the advice and information in this book is believed to be true and accurate at the date of publication, OneStream Press, the authors, and OneStream Software LLC do not guarantee the accuracy, adequacy, or completeness of any information, and are not responsible for any errors or omissions or the results obtained from the use of such information.

OneStream Press, the authors, and OneStream Software LLC make no warranty, express or implied, with respect to the material contained herein, and hereby disclaim any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from negligence, accident, or any other cause.

About the Authors

Eric Telhiard is the Senior Director of Demo Engineering at OneStream Software. Since joining the company in 2020, he has played a pivotal role in shaping the demo development experience, leading vertical industry-build initiatives, and driving innovation across the demo engineering organization. With more than 25 years in Corporate Performance Management (CPM), Eric has helped global organizations navigate complex planning, forecasting, and profitability challenges by crafting tailored, scalable solutions. Eric approaches every challenge with a blend of precision and curiosity, and hopes this book encourages fellow implementers and administrators to explore the full creative potential of the OneStream platform.

To my OneStream teammates – thank you for your brilliance, grit, and the occasional well-timed sarcasm. And to my incredible wife, Michelle, who puts up with more than anyone should have to: you make it all worthwhile.

Jessica Toner is the Director of Vertical Demo Engineering at OneStream Software. She joined the OneStream Software services team in 2017, where she played a vital role in the successful implementation of OneStream’s inaugural Federal customer solution. In 2020, she shifted her focus to Partner Enablement as a Partner Engagement Manager, providing partner implementation support and project management for the OneStream Public Sector practice. In 2021, she advanced to the Presales organization as a Lead Solution Consultant, where she was responsible for managing and enhancing the Public Sector practice’s demo asset portfolio.

Jessica currently oversees the architecture, development, and governance of all Vertical Demo Assets across the enterprise. She also provides technical advisory support to cross-functional teams, ensuring consistency, quality, and innovation in demo build practices throughout the organization.

Prior to joining OneStream in 2017, she amassed over a decade of experience in accounting and finance across diverse industries, enabling her to acquire a deep understanding of the complex financial challenges that many organizations face. Jessica currently resides in Royal Oak, Michigan.

To my amazing Vertical Demo Engineering team – thank you. Your creativity, dedication, and constant support have shaped this work in more ways than I can count. I’m deeply grateful for every idea shared, every challenge tackled together, and the heart you bring to everything you do. I’m honored to work alongside you.

Technical Reviewers

Jack Lacava is a Platform Product Manager at OneStream, with just enough technical skills to be dangerous. He knew Python before it was cool, rides motorbikes, and actually comes from Italy. His wife can’t understand how anybody would ever pay him to do what he does.

Jérôme Marcq is a Lead Solutions Consultant at OneStream, known for his ability to make complex financial and operational data feel simple and manageable. With more than a decade of experience, he has spent his career helping organizations bring structure, clarity, and confidence to their reporting and decision-making processes.

Errata

Despite best efforts, mistakes can sometimes creep into books. If you spot a mistake, please feel free to email us at [email protected] (with the book title in the subject line).

The errata page for this book is hosted at www.onestreampress.com/Workspaces