Atester is a nom-de-net of a well-known writer, speaker, and practitioner of software testing. I have developed and tested hundreds of small and large real-world software systems, on many stacks and application domains. I use both manual and automated testing techniques. I have developed commercial testing software. I have published and presented over a hundred articles and talks for practitioners. I am well-versed in related academic research - I have read and reviewed several thousand papers in refereed journals. I authored and presented a professional development seminar on testing that has been attended by thousands of practitioners.