Lars Bak spent the last three decades designing and implementing object-oriented programming languages. His passion for this area started in 1986 when implementing a runtime system for BETA. Since then, Lars has left marks on several software systems: Self, Strongtalk, JVM HotSpot, JVM CLDC HI, OOVM Smalltalk, V8, and Dart, and lately Toit. In 2018, he received the Dahl-Nygaard prize for design and implementation of several object-oriented systems. Lars has a master’s degree in computer science at Aarhus University from 1988.