In "Efficient Interior Design: Building a Lean Business with a Heart for Helping Others", Joseph Haecker draws on his experience as a successful lighting designer and tech entrepreneur to provide a roadmap for creating a lean, efficient, and profitable interior design business. Using the principles of "The Lean Startup" by Eric Ries, Haecker provides practical advice and actionable steps for interior designers to streamline their business operations, while maintaining a heart for helping others. With a focus on creating a positive impact in the community, this book is a must-read for interior designers who are looking to build a successful and fulfilling business.