István Forgács PhD is an entrepreneur, a test expert and an author. He is the founder and CEO of 4TestDev. István is the co-author of the book Agile Testing Foundations. He is the creator and key contributor of the test-first, codeless test design automation tool Harmony.

István and Attila published their first common book Practical Test Design in 2019. Their website is a unique place where you can exercise test design by executing and improving your tests. They introduced three test design techniques: combinative testing, action-state testing and general predicate testing.