David Leisner

David Leisner is a Principal Software Engineer at Validity Inc. since April 2025, focusing on development for the Litmus Email Previews solution. Previously, David served as a Principal Software Engineer at Litmus from November 2015 until its acquisition by Validity, where expertise in email marketing platform capabilities was honed. Earlier experience includes positions as Senior Software Engineer at Centare, where contributions to software development and agile coaching were made, and roles as Senior Software Developer at POP and Senior Staff Consultant at Centare’s Agile Practice. David also worked as a Senior Software Engineer at Edgenet and held the position of Adjunct Instructor at Carthage College, teaching various courses in e-commerce and systems analysis. Educational credentials include a Bachelor's degree from Marquette University and a Master of Science in Computer and Information Systems from the University of Wisconsin-Parkside.