Dedication: Christian Lexer (1971-2019)
Philosophical Transactions of the Royal Society B
The Royal Society Publishing
School of Science
This thematic issue is dedicated to Christian Lexer, who through his career greatly advanced our knowledge of evolutionary biology, with a particular focus on speciation and reproductive isolation. His life ended suddenly and far too early, and we will miss him dearly as a friend and as a colleague. In this dedication, we offer our personal thoughts that illustrate Christian's contributions to science, through research collaboration and individual relationships.