Marc works as an independent coach, trainer and consultant in the field of (agile) software development and software processes. Marc develops true learning organizations that focus on continuous reflection and improvement: apply, inspect, adapt.

Marc also organizes workshops and conferences on agile and lean software development, extreme programming, systems thinking, theory of constraints, and effective communication. Marc is co-founder of the Agile Open and XP Days Benelux conferences.

Together with Willem van den Ende and Rob Westgeest, he has formed QWAN - Quality Without a Name, an initiative of pragmatic practitioners who deliver training, mentoring, coaching, and development projects.