Gunther ventured into IT and software development after graduating as Engineer in Electronics in 1992. His Agile adventures started with extreme Programming and Scrum in 2003. It was the start of seven years of dedication; years in which Gunther gained experience with Scrum with various teams in various organizations and diverse domains. Upon this foundation, Gunther became the inspiring force behind some large-scale enterprise transformations in 2010.

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In 2011 he became a Professional Scrum Trainer for Scrum.org.
Gunther left consulting in 2013 to establish Ullizee-Inc and partner exclusively with Ken Schwaber, co-creator of Scrum. He managed the “Professional Scrum” series of Scrum.org and shepherded its global network of Professional Scrum Trainers. At Scrum.org, Gunther co-created Agility Path, EBM (Evidence-Based Management) and the Nexus framework for Scaled Professional Scrum. Since 2016 Gunther is continuing his journey to humanize the workplace with Scrum as an independent Scrum Caretaker; a connector, teacher, writer, speaker. He helps organizations re-imagine their Scrum and the surrounding organization to create a more humane and thereby more productive workplace.

Gunther created the acclaimed book "Scrum – A Pocket Guide" in 2013, with a second edition published in 2019 and a third edition in 2021. Ken Schwaber recommends it as “the best description of Scrum available”. In 2020 Gunther published "97 Things Every Scrum Practitioner Should Know"; a collection of essays from field experts across the world. Several translations of his work are available.

When not travelling for Scrum and humanizing the workplace, Gunther lives and works in Antwerp (Belgium).