During his scientific life Albert Visser has contributed to a great variety of disciplines in logic, ranging from provability logics, interpretability, and formal arithmetic to philosophy, linguistics and formal language semantics. This Liber Amicorum is in honour of his long and distinguised career, and nicely bears tribute to the diversity of Albert Visser's interests. Filled with contriubitons from his colleagues, the book illustrates the important role that Albert Visser plays and has played as a logician in the Netherlands and abroad.