Language Design -- Consistent Subtyping for All -- HOBiT: Programming Lenses without using Lens Combinators -- Dualizing Generalized Algebraic Data Types by Matrix Transposition -- Deterministic Concurrency: A Clock-Synchronised Shared Memory Approach -- Probabilistic Programming -- An Assertion-Based Program Logic for Probabilistic Programs -- Fine-grained Semantics for Probabilistic Programs -- How long, O Bayesian network, will I sample thee? -- Relational Reasoning for Markov Chains in a Probabilistic Guarded Lambda Calculus -- Types and Effects -- Failure is Not an Option: An Exceptional Type Theory -- Let Arguments Go First -- Behavioural equivalence via modalities for algebraic effects -- Explicit Effect Subtyping -- Concurrency -- A separation logic for a promising semantics -- Logical Reasoning for Disjoint Permissions -- Deadlock-Free Monitors -- Fragment Abstraction for Concurrent Shape Analysis -- Security -- Reasoning About a Machine with Local Capabilities - Provably Safe Stack and Return Pointer Management -- Modular Product Programs -- Program Verification -- A Fistful of Dollars: Formalizing Asymptotic Complexity Claims via Deductive Program Verification -- Verified Learning Without Regret -- Program Verification by Coinduction -- Velisarios: Byzantine Fault Tolerant Protocols Powered by Coq -- Program Analysis and Automated Verification -- Evaluating Design Tradeoffs in Numeric Static Analysis for Java -- An Abstract Interpretation Framework for Input Data Usage -- Higher-Order Program Verification via HFL Model Checking -- Quantitative Analysis of Smart Contracts -- Session Types and Concurrency -- Session-Typed Concurrent Contracts -- A Typing Discipline for Statically Verified Crash Failure Handling in Distributed Systems -- On Polymorphic Sessions and Functions: A Tale of Two (Fully Abstract) Encodings -- Concurrent Kleene Algebra: Free Model and Completeness -- Concurrency and Distribution -- Correctness of a Concurrent Object Collector for Actor Languages -- Paxos Consensus, Deconstructed and Abstracted -- On Parallel Snapshot Isolation and Release/Acquire Consistency -- Eventual Consistency for CRDTs -- Compiler Verification -- A Verified Compiler from Isabelle/HOL to CakeML -- Compositional Verification of Compiler Optimisations on Relaxed Memory.