For the Original Numix theme which *may* have been used as a base for this ;):

Joern Konopka <cldx3000@googlemail.com>
Georgi Karavasilev <motorslav@gmail.com>
David Barr <dpbarr@gmail.com>
Satyajit Sahoo <satyajit.happy@gmail.com>

For Iris:
Aporva Varshney <avlabs314@gmail.com>

For EvoPop:
Peter Cornelis <poltertec@gmail.com>
Alexandros Fel