ACKNOWLEDGEMENTS
Sincere thanks are due to Paul Silva for providing copies of the documents shown in –, to Øjvind Moestrup, A.K.S.K. Prasad, Tam Sridhar, Srini Srinivasan, and Mike Wynne for providing photographs of members of the original Organizing Committee for the IPS (), to the relevant Editors-in-Chief for providing the photos for , to Alan Millar for assisting in procuring photos of recent Editors-in-Chief and to Adele Harvey for arranging the final figures.