In the Acknowledgements to The Open Society And Its Enemies, Karl Popper writes of the first edition in 1944:

I am deeply indebted to Professor F.A. von Hayek. Without his interest and support this book would not have been published ...

and of the fourth edition in 1961:

Most of the improvements in the fourth edition I owe to Dr William W. Bartley and to Mr. Bryan Magee.

Just these three learned gentlemen (out of perhaps twenty mentioned by Popper) once again test our naming standards. But Frederick Von Hayek has to be the main priority from my perspective and I guess that at least reflects the general Hall Of Fame. Who we bother to create no doubt depends how much we wish to focus on Political Philosophy as the Center Of Why. One interest with Popper is I suppose the crossover of politics with Philosophy Of Science and Mind Body issues - one can at a reasonable pinch see him as a link person between Margaret Thatcher and Roger Penrose, to take two Britons still living who would not primarily be thought of as philosophers but "doers" in their rather different fields of endeavour.