This book is a chronicle of the research, development, and life of the author, who dedicated his career to solar energy. He invented the stacked amorphous silicon solar cell and became the first in the world to successfully industrialize it. Through these achievements, he left a lasting mark on the history of solar power. Despite facing setbacks and serious challenges, his unwavering curiosity and passion for solar power never faltered. Reflecting on his journey as an engineer, R&D manager, and business executive, this insightful memoir also considers the present and future of the solar energy business.