Barry Overeem specializes in liberating organizations from outdated modes of working and learning. He is co-founder of The Liberators, experienced Scrum Master and facilitator, Professional Scrum Trainer (PST) and Steward of the Professional Scrum Master II course at Scrum.org. He has spoken at Scrum Day Europe (2013-2018), XP Days (2014-2018), and Agile/Scrum events in Spain, Ireland, London, Germany, Prague, Turkey, and elsewhere. He writes at medium.com/the-liberators and zombiescrum.org, founded the Dutch Liberating Structures User Group and Liberators Network Meetup, and has run many Liberating Structures Immersion Workshops.