In this chapter we provide brief biographical notes on the participants, focusing on those who made a contribution that is represented in the report. Many are, of course, very well-known figures, but others may not be familiar. For convenience we have arranged them according to their respective host countries (that is, the countries in which they were working at the time of the conference). Rather than provide any kind of extensive biography, we simply focus on key details and material that is relevant to the conference theme.