Leonidas Hepis has been testing software and managing software test teams since 1994. He helps organizations understand what can be known and what cannot be known through product testing. Better informed about the limits of testing, organizations can improve their processes and products, to produce higher value for their paying customers. He co-edited and published The Book on Software Testing. He is a certified MBTI practitioner, and a Satir practitioner, helping organizations value the variety of personality types and their diverse skills in problem-solving.