Philip Crosby was an influential American businessman and quality management expert, best known for his work in the field of quality assurance. He introduced the concept of "zero defects," emphasizing that organizations should strive for perfection in their processes to eliminate errors and improve overall quality. Crosby's ideas significantly shaped modern quality management practices. Crosby authored several books, including "Quality is Free," where he argued that investing in quality improvement ultimately saves money. He founded the Crosby Quality College and served as a consultant, helping various companies implement effective quality management systems. His contributions have had a lasting impact on industries worldwide.