Lisa Crispin is a well-known tester at Pivotal Labs who specializes in helping testers find their place in Agile teams and guiding development with business-facing tests. She co-authored two influential books on Agile testing, including "Agile Testing: A Practical Guide for Testers and Agile Teams" and "More Agile Testing: Learning Journeys for the Whole Team". Janet Gregory is an Agile coach who has also written several books on Agile quality processes, including those co-authored with Lisa Crispin. Mary Thorn is a Director of Quality at Ipreo who is passionate about building and improving test teams, while Elisabeth Hendrickson is VP of Engineering and Big Data at Pivotal, helping individuals and organizations discover the benefits of testing in increasing agility. All four women are experts in their respective fields and have made significant contributions to the testing world, making them valuable resources for anyone looking to learn from their experiences and insights.