Diplomacy in the modern era, an era sometimes called the ‘long peace’ (Gaddis 1989) due to the absence of major war since 1945, has deepened and widened in complexity. Nowadays, it would be ill advised to base a description of diplomacy on actions short of, or in response to, war between states. Diplomacy today is integral to ensuring that our period of long peace gets longer and that the world we live in is as conducive as possible to the progress of the individual, as well as the state. As today’s world is more linked and interdependent than ever before, effective and skilful diplomacy is vital to ensure that humankind can navigate an ever-growing list of shared challenges such as climate change, pandemics, transnational terrorism and nuclear proliferation that may be our undoing if left unresolved. So, while you may not know the names of many of those engaged in diplomatic endeavours, nor see much of their hard work credited in the media, their work is more important than ever to all of us.